Inferior rectus muscle recession as a treatment for vertical diplopia following cataract extraction

Strabismus patterns after cataract surgery in adults

New-onset binocular diplopia after cataract surgery in adults is a rare but significant complication. The aim of this study was to analyze causes, risk factors, and treatment outcomes. Forty consecutive patients with new-onset binocular diplopia after uncomplicated cataract surgery were enrolled in this retrospective study at a tertiary medical center. We evaluated risk factors including type of anesthesia, preoperative presence of strabismus, and others regarding their effect on the development of diplopia after cataract surgery. We further analyzed ocular alignment and motility at presentation and during the clinical course. The majority of the patients with new-onset diplopia presented after cataract surgery on the left eye (28 of 40). Vertical strabismus occurred in 37 of 40 patients, and regional (peri- or retrobulbar) anesthesia was the main risk factor for postoperative diplopia (present in 37 of 40). There were four distinct ocular dysmotility patterns in patients with vertical strabismus: deficient elevation with (type 1a) or without over-depression (type 1b), deficient depression (type 2), or normal motility (type 3). After surgery of the right eye, most patients (6 of 9) showed type 2. After cataract surgery on the left eye, type 1a was most common (20 of 24). Three patients had horizontal strabismus due to a decompensated heterophoria or convergence insufficiency. In total, 17 patients required strabismus surgery (mean 1.3 operations, range 1-3). Regional anesthesia was the main risk factor for new-onset diplopia after cataract surgery in adults. Distinct strabismus patterns were observed for left and right eyes.d.

Predictive factors for corrective effect of inferior rectus recession for congenital superior oblique palsy

PURPOSE

To identify preoperative factors associated with the surgical corrective effect of contralateral inferior rectus recession (IRR) for vertical deviation in patients with congenital superior oblique palsy (SOP).

METHODS

This retrospective study included 20 treatment-naïve patients with unilateral congenital SOP (age range, 6-79 years) who underwent contralateral IRR according to our basic policy to select IRR for paretic eye fixation. The corrective effect (°/mm) of IRR was defined as the difference in the vertical deviation at the primary gaze position between before and 6-18 months after surgery per distance of recession. We also measured the preoperative vertical deviation at primary and secondary gaze positions, and vertical deviation with head-tilting, and calculated the difference in vertical deviation between these positions. We analyzed the correlation between the corrective effect of IRR and these study parameters.

RESULTS

The mean corrective effect of IRR was 2.4 ± 1.6°/mm, which had a significant correlation with preoperative differences in vertical deviation between the primary gaze position and the downward (P = 0.004, r = -0.61) and contralateral gaze positions (P = 0.03, r = -0.48); and the presence of preoperative stereopsis (P = 0.02, r = -0.51). After excluding a statistical outlier, the correlation between the corrective effect and the difference between the primary and contralateral gaze positions was no longer significant (P = 0.07), while the other two relationships remained significant.

CONCLUSIONS

Our findings suggest that preoperative differences in vertical deviation between the primary and downward gaze positions and the presence of preoperative stereopsis are important considerations prior to performing IRR for congenital SOP, particularly with paretic eye fixation.

Strabismus After Ocular Surgery

Many types of ocular surgery can cause diplopia, including eyelid, conjunctival, cataract, refractive, glaucoma, retinal, and orbital surgery. Mechanisms include direct injury to the extraocular muscles from surgery or anesthesia, scarring of the muscle complex and/or conjunctiva, alteration of the muscle pulley system, mass effects from implants, and muscle displacement. Diplopia can also result from a loss of fusion secondary to long-standing poor vision in one eye or from a decompensation of preexisting strabismus that was not recognized preoperatively. Treatment, which typically begins with prisms and is followed by surgery when necessary, can be challenging. In this review, the incidence, mechanisms, and treatments involved in diplopia after various ocular surgeries are discussed. [J Pediatr Ophthalmol Strabismus. 2017;54(5):272-281.].

Diplopia as the Complication of Cataract Surgery

The authors present systematic review of aetiology and treatment of diplopia related to cataract surgery. The problem is set in the modern perspective of changing cataract surgery. Actual incidence is discussed as well as various modalities of therapeutic options. The authors provide the guidance for the contemporary cataract surgeon, when to expect potential problem in ocular motility after cataract surgery.