International Journal of Research and Review Vol. 10; Issue: 2; February 2023 Website: www.ijrrjournal.com Original Research Article E-ISSN: 2349-9788; P-ISSN: 2454-2237 International Journal of Research and Review (ijrrjournal.com) 295 Volume 10; Issue: 2; February 2023 Effect of Cataract Extraction with Intraocular Lens Implant on Contrast Sensitivity, Colour Vision and Photostress Recovery Time Odinkemelu, M.C. 1 , Megwas, A.U. 2 , Azuamah, Y.C. 3 , Esenwah, E.C. 4 , Ikoro, N.C. 5 1,2,3,4,5 Department of Optometry, Federal University of Technology, Owerri, Nigeria Corresponding Author: Odinkemelu, M.C. DOI: https://doi.org/10.52403/ijrr.20230237 ABSTRACT A cataract is a cloudy area in the lens of the eye that can lead to a reduction in vision and visual functions. This study was a clinical study aimed at determining the effect of cataract extraction with intraocular lens (IOL) implant on contrast sensitivity, color vision and photostress recovery time. A total of 70 patients who visited Ajeromi General Hospital, Lagos, Nigeria was used for the study. Contrast sensitivity was assessed using the Pelli-Robson contrast sensitivity chart. The colour vision of the subjects was assessed using Ishihara Pseudochromatic colour vision chart and the photostress recovery time was assessed using a bright ophthalmoscope light. Results showed that the mean contrast sensitivity of the subjects before cataract extraction with IOL implant was 1.04±0.08. After cataract extraction, the mean was 2.19±0.07. The mean colour vision test value before cataract extraction with IOL implant was 14.41±0.53. After cataract extraction, the mean was 16.00±0.00. The mean Photostress Recovery Time before cataract extraction with IOL implant was 55.77±1.81 seconds. After cataract extraction, the mean was 29.11±0.83 seconds. SPSS data analysis with the Paired sample T-Test at 0.05 level of significance showed a significant improvement (P<0.05) in contrast sensitivity, color vision and photostress recovery time before and after cataract extraction with IOL implant. It was recommended that all patients with monocular and bilateral cataract be referred for cataract extraction with intraocular lens (IOL) implant. Key words: Cataract, Intraocular lens, Contrast sensitivity, Color vision, Photostress recovery time INTRODUCTION A cataract is a cloudy area in the lens of the eye that leads to a decrease in vision. Cataracts often develop slowly and can affect one or both eyes. Symptoms may include faded colors, blurry or double vision, halos around light, trouble with bright lights, and trouble seeing at night. [1] This may result in difficulty seeing well while driving, reading, or recognizing faces. Poor vision caused by cataracts may also result in an increased risk of falling and depression. Cataracts cause half of all cases of blindness and 33% of visual impairment worldwide. [2] Cataracts are most commonly due to aging but may also occur due to trauma or radiation exposure. It may be present from birth, or may occur following eye surgery for other problems. Risk factors include diabetes, longstanding use of corticosteroid medication, smoking tobacco, prolonged exposure to sunlight, and alcohol intake. [3] The underlying mechanism involves accumulation of clumps of protein or yellow-brown pigment in the lens that reduces transmission of light to the retina at the back of the eye. [4] Diagnosis is by a pen light eye examination. Surgery to remove the cloudy lens and replace it with an artificial lens is the only effective treatment.