cataract, glaucoma, RNFL, OCT
Background: Cataract and glaucoma are the commonest causes of visual loss in elderly population and are often found to coexist. The association of glaucoma with cataract has become more frequent with the increase in life expectancy. Glaucoma is characterized by progressive optic neuropathy and optic disc and visual field damage. Structural changes can be imaged with OCT. As the cataract progress, the quality of scanned images get worsens. Hence the measured thickness of the retinal nerve fiber layer may not correspond to actual and this should be taken into account while making diagnosis and analysis.
Objectives: To measure retinal nerve fibre layer thickness before and after cataract surgery using OCT.
Material and methods: A prospective observational study was conducted at Sardar Patel Medical College, Bikaner from 1st August 2019 to 31st December 2020 on 100 patients, with cataractous lens changes undergoing cataract surgery. Pre- and postoperative RNFL scans were performed by the OCT.
Results: The average RNFL thickness measurement increased from 85.42 ± 10.15 μm to 91.08 ± 10.77μm after cataract surgery. An increase of 5% (P < 0.001) was found. The signal strength improved from 4.55 ± 0.62 to 8.0 ± 0.54, an increase by 75.7% (P < 0.001)
Conclusion: There was an increase in signal strength after cataract surgery in our study. Measurement of RNFL thickness parameters by SD- OCT is significantly altered following cataract surgery. Post the cataract surgery; a new baseline needs to be established for assessing the longitudinal follow-up of a glaucoma patient.
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