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Wang Y, Guo Y, Wei S, Wu T, Yuan Y, Zhang Y, Li X, Chen Y. Dynamic Visual Acuity After Small Incision Lenticule Extraction for Myopia Patients. Percept Mot Skills 2023; 130:403-418. [PMID: 36226374 DOI: 10.1177/00315125221133434] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In the present study we compared dynamic visual acuity (DVA) of 84 eyes (for 42 adults with myopia; M age = 28.4, SD = 6.6 years; males = 38.1%, females = 61.9%) at 40 and 80 degree per second (dps) before surgery with eyeglass corrections and after a surgical procedure - a small incision lenticule extraction (SMILE). Participants underwent binocular SMILE surgery with plano refraction targets. Their eyeglass-corrected binocular DVA at 40 and 80 dps was evaluated preoperatively, and their uncorrected binocular DVA was assessed post-operatively at 1 week, 1 month and 3 months. The mean logMAR (logarithm of the minimum angle of resolution) uncorrected and corrected distance visual acuities (UDVA and CDVA) were -0.09 and -0.11 respectively, 3 months postoperatively. The mean preoperative eyeglass-corrected DVAs at 40 and 80 dps were 0.141 and 0.184, respectively, and significant improvements were observed for 40 dps and 80 dps DVAs 3 months postoperatively. Pearson's correlations were statistically significant between the postoperative DVAs at 3 months and for both the preoperative DVA and postoperative UDVA at both 40 dps and 80 dps. The change in the DVAs at 3 months were significantly associated with the preoperative DVAs at 40 dps and 80 dps. In conclusion, myopic patients' DVAs significantly improved following SMILE in comparison to corrected preoperative visual acuity when wearing eyeglasses. The post-SMILE DVA was associated with both the preoperative DVA and the postoperative UDVA.
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Affiliation(s)
- Yuexin Wang
- Department of Ophthalmology, 66482Peking University Third Hospital, Beijing, China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Beijing, China
| | - Yining Guo
- Department of Ophthalmology, 66482Peking University Third Hospital, Beijing, China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Beijing, China
| | - Shanshan Wei
- Department of Ophthalmology, 66482Peking University Third Hospital, Beijing, China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Beijing, China
| | - Tingyi Wu
- Department of Ophthalmology, 66482Peking University Third Hospital, Beijing, China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Beijing, China
| | - Yifei Yuan
- Department of Ophthalmology, 66482Peking University Third Hospital, Beijing, China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Beijing, China
| | - Yu Zhang
- Department of Ophthalmology, 66482Peking University Third Hospital, Beijing, China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Beijing, China
| | - Xuemin Li
- Department of Ophthalmology, 66482Peking University Third Hospital, Beijing, China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Beijing, China
| | - Yueguo Chen
- Department of Ophthalmology, 66482Peking University Third Hospital, Beijing, China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Beijing, China
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Medina JM, Mullen KT. Colour-luminance interactions in binocular summation. Vision Res 2007; 47:1120-8. [PMID: 17343891 DOI: 10.1016/j.visres.2007.01.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2006] [Revised: 01/18/2007] [Accepted: 01/25/2007] [Indexed: 11/24/2022]
Abstract
Using a noise-masking paradigm we test the notion of binocular detection mechanisms that combine luminance and colour contrast. Binocular summation was measured for achromatic and red-green isoluminant Gabor stimuli over a range of temporal frequencies and was compared with and without the presence of a two-dimensional, dynamic, luminance noise mask (correlated). While we found that luminance noise reduced binocular luminance summation at all temporal frequencies, binocular red-green summation was reduced only at frequencies of 8 Hz and above. Our results suggest the existence of binocular colour-luminance interactions restricted to high temporal frequencies.
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Affiliation(s)
- José M Medina
- McGill Vision Research, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada H3A 1A1.
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Heinrich SP. A primer on motion visual evoked potentials. Doc Ophthalmol 2007; 114:83-105. [PMID: 17431818 DOI: 10.1007/s10633-006-9043-8] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2006] [Revised: 11/28/2006] [Indexed: 12/18/2022]
Abstract
Motion visual evoked potentials (motion VEPs) have been used since the late 1960s to investigate the properties of human visual motion processing, and continue to be a popular tool with a possible future in clinical diagnosis. This review first provides a synopsis of the characteristics of motion VEPs and then summarizes important methodological aspects. A subsequent overview illustrates how motion VEPs have been applied to study basic functions of human motion processing and shows perspectives for their use as a diagnostic tool.
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Affiliation(s)
- Sven P Heinrich
- Sektion Funktionelle Sehforschung, Universitäts-Augenklinik, Freiburg, Germany.
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Kuba M, Kubová Z, Kremlácek J, Langrová J. Motion-onset VEPs: Characteristics, methods, and diagnostic use. Vision Res 2007; 47:189-202. [PMID: 17129593 DOI: 10.1016/j.visres.2006.09.020] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2006] [Revised: 08/16/2006] [Accepted: 09/13/2006] [Indexed: 10/23/2022]
Abstract
This review article summarises the research on the motion-onset visual evoked potentials (VEPs) and important motion stimulus parameters which have been clarified. For activation of the visual motion processing system and evocation of the motion-onset specific N2 peak (with latency of 160-200ms) from the extra-striate temporo-occipital and/or parietal cortex, the following stimulus parameters can be recently recommended: low luminance (<ca. 20cd/m(2)) and low contrast (<ca. 10%-sinusoidally modulated) of a moving structure with low velocity and temporal frequency (<ca. 6Hz). A short (up to 200ms) duration of motion and a long (at least 1s) inter-stimulus interval reduce adaptation to motion and predominance of a pattern-related P1 peak. Radial motion (with increasing velocity and decreasing spatial frequency towards the periphery) produces larger reactions as compared to a unidirectional translation. In view of the slow maturation (up to the age of 18 years) and early ageing of the visual motion processing system, the use of age-dependent latency norms may be necessary. Since early or selective involvement of the motion processing system is suspected in some CNS disorders, we suggest an evaluation of the utility of motion-onset VEPs as part of the electrophysiological CNS examination since this method may recognise motion processing involvement better than other methods. Motion-onset VEPs might increase the sensitivity of this examination for diagnosing CNS diseases including Multiple Sclerosis, Neuroborreliosis, Glaucoma, Dyslexia and Encephalopathies.
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Affiliation(s)
- M Kuba
- Electrophysiological Laboratory, Department of Pathophysiology, Charles University in Prague, Faculty of Medicine in Hradec Králové, Simkova 870, 500 38 Hradec Králové, Czech Republic.
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Riecanský I, Thiele A, Distler C, Hoffmann KP. Chromatic sensitivity of neurones in area MT of the anaesthetised macaque monkey compared to human motion perception. Exp Brain Res 2005; 167:504-25. [PMID: 16170529 DOI: 10.1007/s00221-005-0058-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2005] [Accepted: 05/06/2005] [Indexed: 10/25/2022]
Abstract
We recorded activity from neurones in cortical motion-processing areas, middle temporal area (MT) and middle posterior superior temporal sulcus (MST), of anaesthetised and paralysed macaque monkeys in response to moving sinewave gratings modulated in luminance and chrominance. The activity of MT and MST neurones was highly dependent on luminance contrast. In three of four animals isoluminant chromatic modulations failed to activate MT/MST neurones significantly. At low luminance contrast a systematic dependence on chromaticity was revealed, attributable mostly to residual activity of the magnocellular pathway. Additionally, we found indications for a weak S-cone input, but rod intrusion could also have made a contribution. In contrast to the activity of MT and MST neurones, speed judgments and onset amplitude of evoked optokinetic eye movements in human subjects confronted with equivalent visual stimuli were largely independent of luminance modulation. Motion of every grating (including isoluminant) was readily visible for all but one observer. Similarity with the activity of MT/MST cells was found only for motion-nulling equivalent luminance contrast judgments at isoluminance. Our results suggest that areas MT and MST may not be involved in the processing of chromatic motion, but effects of central anaesthesia and/or the existence of intra- and inter-species differences must also be considered.
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Affiliation(s)
- Igor Riecanský
- Department of General Zoology and Neurobiology, Ruhr University Bochum, Bochum, Germany
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Kuriki I, Sadamoto K, Takeda T. MEG recording from the human ventro-occipital cortex in response to
isoluminant color stimulation. Vis Neurosci 2005; 22:283-93. [PMID: 16079004 DOI: 10.1017/s0952523805223040] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2004] [Accepted: 02/23/2005] [Indexed: 11/06/2022]
Abstract
In contrast to PET and fMRI studies, color-selective responses from
the ventro-occipital area have rarely been reported in MEG studies. We
tried to minimize the stimulation to all areas in the visual system except
the color-processing ones by using a color space based on psychophysical
and physiological knowledge in order to maximize the signal-to-noise ratio
for MEG responses from the ventro-occipital area. MEG obtained from long
intermittent reversals (2.0–3.5 s) of isoluminant chromatic gratings
showed two major peaks at the latencies of approximately 100 and 150 ms.
The estimated location of the equivalent-current dipole for response at
100-ms latency was in the calcarine sulcus and that of the dipole for the
response at 150 ms was in the collateral sulcus in the ventro-occipital
area. The response around 150 ms was uniquely observed in MEG elicited by
chromatic reversals. The average of lags between MEG responses from the
calcarine sulcus and ventro-occipital area was 43 ms, which suggests
sequential processing of color information across the visual cortices.
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Affiliation(s)
- Ichiro Kuriki
- Human and Information Science Laboratory, NTT Communication Science Laboratories, Kanagawa, Japan.
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Ventura DF, Simões AL, Tomaz S, Costa MF, Lago M, Costa MTV, Canto-Pereira LHM, de Souza JM, Faria MAM, Silveira LCL. Colour vision and contrast sensitivity losses of mercury intoxicated industry workers in Brazil. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2005; 19:523-529. [PMID: 21783522 DOI: 10.1016/j.etap.2004.12.016] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We evaluated vision loss in workers from fluorescent lamp industries (n=39) who had retired due to intoxication with mercury vapour and had been away from the work situation for several years (mean=6.32 years). An age-matched control group was submitted to the same tests for comparison. The luminance contrast sensitivity (CSF) was measured psychophysically and with the sweep visual evoked potential (sVEP) method. Chromatic red-green and blue-yellow CSFs were measured psychophysically. Colour discrimination was assessed with the Farnsworth-Munsell 100-hue test, Lanthony D-15d test and Cambridge Colour Vision Test. Patient data showed significantly lower scores in all colour tests compared to controls (p<.001). The behavioural luminance CSF of the patients was lower than that of controls (p<.001 at all frequencies tested). This result was confirmed by the electrophysiologically measured sweep VEP luminance CSF except at the highest frequencies-a difference that might be related to stimulus differences in the two situations. Chromatic CSFs were also statistically significantly lower for the patients than for the controls, for both chromatic equiluminant stimuli: red-green (p<.005) and blue-yellow (p<.04 for all frequencies, except 2 cycles per degree (cpd), the highest spatial frequency tested) spatial gratings. We conclude that exposure to elemental mercury vapour is associated with profound and lasting losses in achromatic and chromatic visual functions, affecting the magno-, parvo- and koniocellular visual pathways.
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Affiliation(s)
- D F Ventura
- Instituto de Psicologia, Universidade de São Paulo, Av. Prof. Mello Moraes 1721, 05508-900 São Paulo, SP, Brazil; Núcleo de Neurociências e Comportamento, Universidade de São Paulo, São Paulo, Brazil
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