Eye muscle surgery for crossed eyes improves vision: KGMU

Lucknow, Nov 18 (IANS): A study has found that eye muscle surgery, performed to correct eye position in patients with “squinting”, also improves binocular vision.

The study titled “Binocular Summation in Comitant Exotropia: Change After Surgery” conducted by ophthalmologists at King George Medical University (KGMU) found that out of 20 children aged four to eight who had “eyes crossed”, a change was observed.

Professor Siddhartha Agrawal, Professor in the Department of Ophthalmology, KGMU, who led the study, was congratulated with the “Best Clinical Paper” at the 2022 KGMU Research Showcase.

The study was conducted to assess the change in binocular summation (BiS) in children whose one eye had deviated outwards towards the other eye. They underwent eye muscle surgery in 2021 and were under observation for three months after the operation.

“The BiS score which shows the change in vision seen when both eyes are used (binocular) compared to one eye was calculated for this purpose. BiS was found to have improved sooner after surgery; it was not considered a benefit for eye muscle surgery,” he added.

“For BiS, we recorded the vision and contrast sensitivity of both eyes separately and together (binocularly). Later, before and after the operation, the results were compared,” Prof Siddhartha said.

To measure vision, a visual acuity (VA) examination method was used in which a series of tests were performed to assess vision and the ability to focus on and discern objects.

A Pelli Robson test was performed to measure a patient’s contrast sensitivity (CS) by finding the lowest contrast letters.

“All patients had a successful motor outcome after surgery. It was found that the post-operative VA score improved from 2.9 to 4.5 on average and the SC improved by 2. 7 at 4.5,” he added.

“Although the sample size is smaller and further studies are needed to establish this, we recommend its inclusion in the evaluation of functional outcomes of eye muscle surgery,” said Professor Siddhartha.

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