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Recep ÖF, Kocabas DO, Kiziltoprak H, Ozulken K. Effects on Wavefront Aberration after Short-term Wear of Senofilcon A Photochromic Contact Lens. Klin Monbl Augenheilkd 2022. [PMID: 36347502 DOI: 10.1055/a-1973-8904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
BACKGROUND To assess the variability in wavefront aberrations with short-term wear of photochromic senofilcon A contact lenses in both its activated and inactive states. METHODS AND MATERIAL In this cross-sectional study, 20 participants who had previously used soft contact lenses were enrolled. Corneal aberrometry measurements were performed on each subject, without contact lenses, using Sirius Scheimpflug-Placido topography. The photochromic lenses were illuminated using a blue-violet light (λ max = 420 nm) so as to provoke an activated state, and measurements were taken with the lenses inserted, in both states. The root mean square (RMS) of the aberrations was calculated, and the higher- and lower-order aberrations, astigmatism, coma, spherical aberration, and trefoil measurements were evaluated using a 5.0-mm pupil diameter. RESULTS The average contact lens sphere power was - 2.33 ± 1.07 D. The mean refractive errors with contact lens wear were 0.07 ± 0.18 D for the sphere and - 0.26 ± 0.15 D for the cylinder. The mean RMS values for all the corneal aberrations showed no statistically significant differences with and without contact lenses (p > 0.05). In a bivariate correlation analysis, there was a positive correlation between contact lens sphere power and coma (vertical and horizontal) in the activated state (r = 0.455, p = 0.44 and r = 0.495, p = 0.27, respectively). CONCLUSION The photochromic contact lenses did not influence ocular aberration during short-term wear, even when the photochromatic additive was activated. This property may help to provide more comfortable vision with lens wear. This finding needs to be verified by further studies.
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Affiliation(s)
| | | | - Hasan Kiziltoprak
- Ophthalmology, Adıyaman University Training and Research Hospital, Adıyaman, Turkey
| | - Kemal Ozulken
- Ophthalmology, TOBB Economics and Technology University Faculty of Medicine, Ankara, Turkey
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Taskiran-Sag A, Eroglu E, Ozulken K, Canlar S, Poyraz BM, Sekerlisoy MB, Mumcuoglu T. Headache and cognitive disturbance correlate with ganglion cell layer thickness in patients who recovered from COVID-19. Clin Neurol Neurosurg 2022; 217:107263. [PMID: 35525105 PMCID: PMC9040445 DOI: 10.1016/j.clineuro.2022.107263] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 03/11/2022] [Accepted: 04/11/2022] [Indexed: 11/03/2022]
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Ozulken K, Gokce SE, Tekin K. Acute clouding of a trifocal intraocular lens during implantation: A case report. Am J Ophthalmol Case Rep 2022; 25:101258. [PMID: 35128148 PMCID: PMC8802878 DOI: 10.1016/j.ajoc.2022.101258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 08/01/2021] [Accepted: 01/13/2022] [Indexed: 11/30/2022] Open
Affiliation(s)
- Kemal Ozulken
- TOBB ETU School of Medicine, Department of Ophthalmology, Ankara, Turkey
| | - Sabite Emine Gokce
- Dr. Abdurrahman Yurtaslan Training and Research Hospital, Department of Ophthalmology, Ankara, Turkey
| | - Kemal Tekin
- Ulucanlar Eye Training and Research Hospital, Department of Ophthalmology, Ankara, Turkey
- Corresponding author.
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Abstract
Aim: To compare the outcomes of non-invasive break-up time (NI-BUT) test and the other conventional dry eye tests.Methods: The right eyes of 170 subjects were included in the study. In order to evaluate the tear quality of the patients, NI-BUT levels were measured by the Scheimplug-Placido disk system (Sirius topography). Tear osmolarity test was performed with TearLab Osmolarity System. Topical anesthesia-assisted type I Schirmer test and topical anesthesia-assisted BUT were lastly applied to all patients in order not to affect other measurements.Results: The mean NI-BUT value was 9.59 ± 4.37 sec, tear osmolarity was 292.93 ± 9.30 mOsm/L, Schirmer test was 15.32 ± 6.05 mm/5 min, and biomicroscopic BUT value was 8.98 ± 3.79 sec. The Schirmer test results were statistically significantly correlated with biomicroscopic BUT and NI-BUT values (p = .019, r = 0.180 and p = .030, r = 0.166; respectively). It was also found that tear osmolarity was strongly and inversely correlated with biomicroscopic BUT and topographic NI-BUT values (p < .001, r = -0.554 and p < .001, r = -0.528; respectively). There was no significant correlation between Schirmer test and tear osmolarity.Conclusion: It is important to use a sensitive, reproducible and non-invasive method in the evaluation of tear functions. We think that the objective and noninvasive topographic NI-BUT measurements and the minimally invasive osmolarity measurements should be used more frequently in practice because they are correlated with the measurements obtained by invasive methods and should be widespread in clinics.
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Affiliation(s)
- Kemal Ozulken
- Ophthalmology Department, TOBB ETU Medical School, Ankara, Turkey
| | - Gozde Aksoy Aydemir
- Ophthalmology Department, Adıyaman University Training and Research Hospital, Adıyaman, Turkey
| | - Kemal Tekin
- Ophthalmology Department, Van Erciş State Hospital, Van, Turkey
| | - Tarkan Mumcuoğlu
- Ophthalmology Department, TOBB ETU Medical School, Ankara, Turkey
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Ozulken K, Kiziltoprak H, Yuksel E, Mumcuoğlu T. A Comparative Evaluation of Diffractive Trifocal and New Refractive/Extended Depth of Focus Intraocular Lenses for Refractive Lens Exchange. Curr Eye Res 2020; 46:811-817. [PMID: 33047991 DOI: 10.1080/02713683.2020.1833347] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE To evaluate and compare the visual performance and quality of life (QOL) associated with refractive/extended depth of focus (EDOF) intraocular lenses (IOLs) and diffractive trifocal IOLs in refractive lens exchange patients. MATERIALS AND METHODS This was a comparative interventional study of patients undergoing implantation of Lucidis (Swiss Advanced Vision, SAV‑IOL SA, Neuchâtel, Switzerland) or AT LISA tri 839MP (Carl Zeiss Meditec AG, Germany) IOLs. Near, intermediate, and distance best corrected and uncorrected visual acuities were collected at 1 and 3 months postoperatively. The vision-related QOL was evaluated 1 and 3 months after surgery, using the National Eye Institute Visual Function Questionnaire-14 (VF-14 QOL questionnaire). RESULTS A total of 74 patients underwent refractive lens exchange and IOL implantation, with 38 patients in the EDOF group and 36 in the trifocal group. Among all visual acuities, uncorrected near visual acuity was statistically significantly better with the Lucidis IOL at the first month (p = .02) and diminished at the third-month visit (p = .16). When we compared the VF-14 QOL questionnaire scores, reading small print, reading a newspaper or book, and driving at night were statistically significantly better in the Lucidis group at the first month (p = .00, for each). That difference persisted only in driving at night at the third-month visit (p = .04). Reading small print, driving at night, and doing fine handwork were the most difficult tasks in the AT LISA group at the first month, and only driving at night remained so at the third-month visit. CONCLUSIONS The refractive results and visual outcomes at all distances of EDOF and trifocal IOLs were highly satisfactory. However, the EDOF design in the Lucidis IOL achieves lower rates of glare in the early period after refractive lens exchange.
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Affiliation(s)
- Kemal Ozulken
- Ophthalmology Department, TOBB ETU Medical School, Ankara, Turkey
| | - Hasan Kiziltoprak
- Ophthalmology Department, Bingol Women's Health and Children's Hospital, Bingol, Turkey
| | - Erdem Yuksel
- Ophthalmology Department, Kastamonu Medical School, Kastamonu, Turkey
| | - Tarkan Mumcuoğlu
- Ophthalmology Department, TOBB ETU Medical School, Ankara, Turkey
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Ozulken K, Ilhan C, Yuksel E, Mumcuoglu T. Preliminary effects of treating the half of high latent hyperopia on refractive and visual results of femtosecond laser-assisted in situ keratomileusis in subjects with hyperopia. Int Ophthalmol 2020; 40:2361-2369. [PMID: 32430870 DOI: 10.1007/s10792-020-01421-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 05/11/2020] [Indexed: 10/24/2022]
Abstract
BACKGROUND To evaluate the preliminary effects of treating the half of high latent hyperopia on refractive and visual outcomes of femtosecond laser-assisted in situ keratomileusis (LASIK) in young subjects with hyperopia. METHODS This non-randomized comparative study includes 120 eyes of 60 subjects who underwent femtosecond LASIK to correct hyperopia. Group 1 (n = 60) includes subjects with ≤ 1D algebraic difference (DRSE) between cycloplegic (CRSE) and manifest (MRSE) refraction spherical equivalents and was treated by entering manifest refraction values. Group 2 includes subjects with > 1D DRSE and was treated by entering the mean manifest and cycloplegic refraction values. Refractive and subjective outcomes obtained at the 1-, 3-, and 6-month postoperative visits were compared. RESULTS The mean age of the subjects was 26.2 ± 3.5 and 26.2 ± 5.2 years for Group 1 and Group 2, respectively. The male-to-female ratios were 10/10 in both groups. Demographic values of the groups were similar (p > 0.05). Preoperative MRSE values were similar (p = 0.924), while CRSE and DRSE values were significantly higher in Group 2 (p < 0.001). At the 1- and 3-month postoperative visits, MRSE was higher and uncorrected distance visual acuity (UDVA) was lower in Group 2 (p < 0.001). Subjective visual parameters and quality of vision scores were also worse in Group 2 during these visits (p < 0.001); however, at the 6-month visit, all outcomes for Group 2 improved, and MRSE, UDVA, some subjective visual parameters, and quality of vision scores became similar between groups (p > 0.05). CONCLUSION At the 6-month visit after treating the half of > 1D latent hyperopia with femtosecond LASIK, refractive and visual outcomes like MRSE, UDVA, subjective visual parameters, and quality of vision scores become similar to those obtained in ≤ 1D latent hyperopia.
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Affiliation(s)
- Kemal Ozulken
- Department of Ophthalmology, TOBB ETU, Ankara, Turkey
| | - Cagri Ilhan
- Department of Ophthalmology, Hatay State Hospital, Antakya, Hatay, Turkey.
| | - Erdem Yuksel
- Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Boston, MA, USA
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Koc M, Tekin K, Kiziltoprak H, Inanc M, Kosekahya P, Ozulken K, Durukan I. Topometric and Tomographic Evaluation of Subclinical Keratoconus. Ophthalmic Epidemiol 2020; 27:289-297. [PMID: 32172662 DOI: 10.1080/09286586.2020.1741010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
PURPOSE To investigate the corneal topometric and tomographic findings that can be used in the diagnosis of subclinical keratoconus. METHODS A retrospective cohort study. The study group was selected from patients with clinically evident keratoconus in one eye and subclinical keratoconus without evident topographic findings in fellow eye. The age-matched control group was selected from patients who were candidates for laser in situ keratomileusis (LASIK) and did not develop ectasia after LASIK surgery at least 1-year follow-up. All subjects underwent topographic, topometric and tomographic (Belin-Ambrósio Enhanced Ectasia Display III) analyses via a Pentacam HR rotating Scheimpflug camera (Oculus, Germany, version 1.20r.98) before LASIK surgery. RESULTS The study group consisted of 151 patients (69 male and 82 female, mean age of 24.8 ± 7.2 years) and the control group also consisted of 150 patients (70 male and 80 female, mean age of 26.0 ± 6.3 years). There were statistically significant differences in all measured topometric (p˂.05) and tomographic (p˂.001) parameters between the eyes with subclinical keratoconus and those of the control group. In discriminating eyes with subclinical keratoconus from normal eyes, final D showed the highest area under curve value (0.858, sensitivity 85.2%, specificity 66.7%), followed by maximum pachymetric progression index (0.809, sensitivity 81.9%, specificity 69.4%) and average pachymetric progression index (0.796, sensitivity 81.9%, specificity 68.1%) in receiver operating characteristic analysis. CONCLUSION Topometric and tomographic parameters might be useful for early detection of keratoconus, but the sensitivity and specificity of any parameter are not high enough to be used alone.
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Affiliation(s)
- Mustafa Koc
- Ophthalmology Department, Ankara Ulucanlar Eye Training and Research Hospital , Ankara, Turkey
| | - Kemal Tekin
- Ophthalmology Department, Ercis State Hospital , Van, Turkey
| | - Hasan Kiziltoprak
- Ophthalmology Department, Ankara Ulucanlar Eye Training and Research Hospital , Ankara, Turkey
| | - Merve Inanc
- Ophthalmology Department, Ercis State Hospital , Van, Turkey
| | - Pinar Kosekahya
- Ophthalmology Department, Ankara Ulucanlar Eye Training and Research Hospital , Ankara, Turkey
| | - Kemal Ozulken
- Ophthalmology Department, TOBB ETU Hospital , Ankara, Turkey
| | - Irfan Durukan
- Ophthalmology department, Era Eye Hospital , Ankara, Turkey
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Ozulken K, Gokce SE. Evaluation of the effect of optic zone diameter selection on high-order aberrations in photorefractive keratectomy excimer laser treatment. Lasers Med Sci 2020; 35:1543-1547. [DOI: 10.1007/s10103-020-02948-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 01/02/2020] [Indexed: 11/29/2022]
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Ozulken K, Yuksel E, Uzel MM. Effect of topical pilocarpine on refractive surgery outcomes. Int Ophthalmol 2019; 40:733-740. [PMID: 31758508 DOI: 10.1007/s10792-019-01235-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 11/16/2019] [Indexed: 11/29/2022]
Abstract
PURPOSE To investigate the effect of topical pilocarpine on topical cycloplegia and on the results of refractive surgery. METHODS The study included 100 eyes of 100 patients who underwent laser-assisted in situ keratomileusis. Group 1 comprised patients who wanted to undergo surgery on the same day after cycloplegic examination and were applied with 2% pilocarpine hydrochloride; group 2 comprised patients whose pupils spontaneously went into the natural position. Corneal thickness, mean refractive spherical equivalent (MRSE), uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), pupil diameter, pupil center shift and high-order aberrations (HOAs) were compared between the two groups. RESULTS There were no statistically significant differences between the groups in respect of preoperative age, gender, corneal thickness, MRSE, UDVA and CDVA. The pupil diameter was not statistically significant between the groups. Pupil diameter after pilocarpine was not statistically significant when compared with the natural pupil diameter. There were no statistically significant differences in postoperative HOA between the two groups. CONCLUSIONS The pupillary dilatation and the associated pupillary shift were reduced with pilocarpine. Postoperative refractive values and aberrations showed no difference between the groups.
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Affiliation(s)
- Kemal Ozulken
- Ophthalmology Department, TOBB ETU Medical School Hospital, Yasam Cad. No:5 Sogutozu, Ankara, Turkey.
| | - Erdem Yuksel
- Ophthalmology Department, Kastamonu University, Kastamonu, Turkey
| | - Mehmet Murat Uzel
- Ophthalmology Department, Afyonkarahisar State Hospital, Afyonkarahisar, Turkey
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Ozulken K, Ilhan C. Effects of Cyclotorsion Orientation and Magnitude in Eyes with Compound Myopic Astigmatism on the Compensation Capacity of WaveLight EX500 Photorefractive Keratectomy. Korean J Ophthalmol 2019; 33:458-466. [PMID: 31612657 PMCID: PMC6791944 DOI: 10.3341/kjo.2019.0042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 07/01/2019] [Accepted: 08/08/2019] [Indexed: 11/23/2022] Open
Abstract
Purpose To investigate the clinical effects of different orientation and magnitude of cyclotorsion on the compensation capacity of the WaveLight EX500 photorefractive keratectomy (PRK) platform. Methods This retrospective study comprised 400 eyes of 200 patients who underwent bilateral simultaneous PRK due to compound myopic astigmatism. The subjects were separated according to the orientation of cyclotorsion into incyclotorsion and excyclotorsion groups, and by the magnitude of cyclotorsion into group 1 (0.50 to 2.50 degrees), group 2 (3.00 to 5.00 degrees), group 3 (5.50 to 7.50 degrees), and group 4 (8.00 to 9.50 degrees). Results The mean magnitude of cyclotorsion was 3.50 ± 2.4 degrees (0.50 to 9.50 degrees) in the incyclotorsion group and 3.32 ± 2.3 degrees (0.50 to 9.50 degrees) in the excyclotorsion group (p = 0.617). The postoperative refractive outcomes of the incyclotorsion and excyclotorsion groups were similar (p > 0.05 for all). The postoperative mean cylindrical refractive error was −0.32 ± 0.3 diopters (D, −1.25 to 0.00 D) in group 1, −0.47 ± 0.2 D (−2.00 to 0.00 D) in group 2, −0.62 ± 0.2 D (−1.00 to −0.25 D) in group 3, and −0.91 ± 0.2 D (−1.50 to −0.50 D) in group 4 (p < 0.001). Preoperative cylindrical refractive error was positively correlated with magnitude of cyclotorsion (r = 0.125 and p = 0.013), which was also positively correlated with postoperative cylindrical refractive error (r = 0.600 and p < 0.001). Conclusions Incyclotorsion and excyclotorsion can be equally compensable in the WaveLight EX500 PRK platform for compound myopic astigmatism. A value of ≤2.50 degrees cyclotorsion magnitude was observed to be more compensable than higher degrees of cyclotorsion magnitude. Preoperative high astigmatism was associated with high cyclotorsion magnitude, which was also associated with a high degree of postoperative astigmatism.
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Affiliation(s)
- Kemal Ozulken
- Department of Ophthalmology, TOBB ETU Hospital, Ankara, Turkey
| | - Cagri Ilhan
- Department of Ophthalmology, Hatay State Hospital, Hatay, Turkey.
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Ozulken K, Yuksel E, Tekin K, Kiziltoprak H, Aydogan S. Comparison of Wavefront-Optimized Ablation and Topography-Guided Contoura Ablation With LYRA Protocol in LASIK. J Refract Surg 2019; 35:222-229. [PMID: 30984979 DOI: 10.3928/1081597x-20190304-02] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Accepted: 03/04/2019] [Indexed: 11/20/2022]
Abstract
PURPOSE To compare the refractive outcomes and aberration data analysis of wavefront-optimized (WFO) ablation and topography-guided Contoura ablation (TGCA) (Contoura on the WaveLight laser; WaveLight GmbH, Erlangen, Germany) in patients who had laser-assisted in situ keratomileusis (LASIK) for myopia or myopic astigmatism. METHODS In this comparative contralateral eye study, patients who underwent LASIK with TGCA in one eye and with WFO ablation in the fellow eye were analyzed. Aberration measurements and corneal topography were analyzed using the WaveLight Oculyzer II diagnostic device (Alcon Laboratories, Inc., Fort Worth, TX). Total corneal higher order aberrations (HOAs) including vertical and oblique astigmatism (Z2 2, Z2 -2), coma (Z3 1, Z3 -1), trefoil (Z3 3, Z3 -3), spherical aberration, and Q value were analyzed. These measurements were taken preoperatively and 3 months postoperatively. RESULTS This study comprised 32 patients. There were no significant differences between both procedures according to postoperative uncorrected and corrected distance visual acuity values, refractive errors, and manifest refraction spherical equivalents within ±0.50 diopters (D) of emmetropia (P > .05). The preoperative corneal HOAs and Q values were also similar between the groups (P > .05). At 3 months postoperatively, the vertical and horizontal coma values in the WFO ablation group were statistically significantly higher compared to the TGCA group (P = .013 and .020, respectively). Less stromal tissue was ablated in the TGCA group compared to the WFO ablation group (P < .001). CONCLUSIONS Although WFO ablation and TGCA protocols had statistically similar visual outcomes, the TGCA protocol was associated with a significantly lower induction in vertical and horizontal coma and smaller amount of tissue ablation compared to WFO ablation. [J Refract Surg. 2019;35(4):222-229.].
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Yuksel E, Ozulken K, Uzel MM, Taslipinar Uzel AG, Aydoğan S. Comparison of Samfilcon A and Lotrafilcon B silicone hydrogel bandage contact lenses in reducing postoperative pain and accelerating re-epithelialization after photorefractive keratectomy. Int Ophthalmol 2019; 39:2569-2574. [DOI: 10.1007/s10792-019-01105-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 04/29/2019] [Indexed: 11/30/2022]
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Koc M, Uzel MM, Tekin K, Kosekahya P, Ozulken K, Yilmazbas P. Effect of preoperative factors on visual acuity, corneal flattening, and corneal haze after accelerated corneal crosslinking. J Cataract Refract Surg 2016; 42:1483-1489. [DOI: 10.1016/j.jcrs.2016.08.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 07/26/2016] [Accepted: 08/12/2016] [Indexed: 11/26/2022]
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Ayar O, Ozmen MC, Muftuoglu O, Akdemir MO, Koc M, Ozulken K. In-vivo corneal biomechanical analysis of unilateral keratoconus. Int J Ophthalmol 2015; 8:1141-5. [PMID: 26682162 DOI: 10.3980/j.issn.2222-3959.2015.06.11] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Accepted: 03/17/2015] [Indexed: 11/02/2022] Open
Abstract
AIM To evaluate and compare corneal biomechanical findings measured by ocular response analyzer, topographic and pachymetric findings in patients with unilateral keratoconus patients and healthy controls. METHODS This is an observational, case-control study. Patients with keratoconus in one eye and forme fruste keratoconus in the fellow eye were compared with sex and age matched with controls healthy subjects. All subjects were evaluated with rotating scheimpflug imaging system. The receiver-operating-characteristic curves were analyzed to evaluate the sensitivity and specificity of the parameters. RESULTS Twenty-seven patients with keratoconus in one eye and forme fruste keratoconus in the fellow eye were compared with 40 eyes of 40 normal subjects. Corneal hysteresis (CH) was 8.0±1.7 mm Hg in keratoconus group, 8.3±1.6 mm Hg in forme fruste keratoconus group, and 9.8±1.6 mm Hg in control groups (P=0.54 between keratoconus and forme fruste keratoconus groups, P<0.01 between control group and other groups). Corneal resistance factor (CRF) was 7.1±2.2 mm Hg in keratoconus group, 7.8±1.2 mm Hg in forme fruste keratoconus group and 9.9±1.5 mm Hg in control group (P<0.001 between control group and other groups). Using receiver-operating-characteristic analysis, the area under curve values of the parameters to distinguish forme fruste keratoconus from control subjects were: CH (0.768), CRF (0.866). Best cut-off points were 9.3 mm Hg and 8.8 mm Hg for CH and CRF respectively. CONCLUSION Ocular response analyzer parameters (CH and CRF) are found to be significantly lower in forme fruste keratoconus patients compared to normal control subjects.
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Affiliation(s)
- Orhan Ayar
- Department of Ophthalmology, Bulent Ecevit University, Kozlu 67600, Zonguldak, Turkey
| | | | - Orkun Muftuoglu
- Department of Ophthalmology, Medipol University, Istanbul 34214, Turkey
| | - Mehmet Orcun Akdemir
- Department of Ophthalmology, Bulent Ecevit University, Kozlu 67600, Zonguldak, Turkey
| | - Mustafa Koc
- Ulucanlar Eye Research and Education Hospital, Ankara 06340, Turkey
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Muftuoglu O, Ayar O, Ozulken K, Ozyol E, Akıncı A. Posterior corneal elevation and back difference corneal elevation in diagnosing forme fruste keratoconus in the fellow eyes of unilateral keratoconus patients. J Cataract Refract Surg 2013; 39:1348-57. [PMID: 23820305 DOI: 10.1016/j.jcrs.2013.03.023] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 03/02/2013] [Accepted: 03/09/2013] [Indexed: 10/26/2022]
Abstract
PURPOSE To evaluate posterior corneal elevation and back difference corneal elevation in patients with keratoconus in 1 eye and forme fruste keratoconus in the fellow eye. SETTING Kudret Eye Hospital, Ankara, Turkey. DESIGN Case-control study. METHODS This study retrospectively reviewed patients with keratoconus in 1 eye and forme fruste keratoconus in the fellow eye and eyes of normal subjects. All subjects were evaluated with a rotating Scheimpflug imaging system (Pentacam), including sagittal and tangential anterior curve analysis, keratometry, and posterior elevation. The back difference elevation values were extrapolated from the difference maps of the Belin-Ambrosió enhanced ectasia display of the Scheimpflug system. The receiver operating characteristic (ROC) curves were analyzed to evaluate the sensitivity and specificity of the parameters. RESULTS The corneal power, pachymetric progression index, and posterior corneal elevation (posterior elevation and back difference elevation) measurements were statistically significantly higher in eyes with keratoconus or forme fruste keratoconus than in eyes of normal control subjects (P<.05). Using ROC analysis, the area under the curve values of mean keratometry, steepest point on the tangential curve, minimum corneal thickness, pachymetric progression index, Ambrósio's relational thickness, posterior elevation, and back difference elevation to distinguish forme fruste keratoconus from control subjects were 0.51, 0.84, 0.65, 0.81, 0.72, 0.68, and 0.76, respectively. CONCLUSIONS Back difference elevation was better than posterior elevation in diagnosing forme fruste keratoconus. However, as sole parameters, both had limited sensitivity and specificity to differentiate between forme fruste keratoconus eyes and normal control eyes.
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Affiliation(s)
- Orkun Muftuoglu
- Department of Ophthalmology (Muftuoglu), Medipol University, Istanbul, Turkey.
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Ozulken K. May consultation #3. J Cataract Refract Surg 2012. [DOI: 10.1016/j.jcrs.2012.03.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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