Experience with straylight in the cataract clinic

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We know that there are many sources of physiologic scatters such modified cornea (after refractive surgery, haze, dystrophies, ocular surface disease), vitreous alterations and lens changes with the aging process inducing progressive cataract and impairing light diffusion. Nowadays, thanks to the access to scatter measurement, we might be able to assess tear film quality dynamics (with an increase in ocular surface desiccation commonly observed in old patients), but moreover we could detect early cataract at the stage of no induced visual acuity decrease but quality of vision degradation. We will present the preliminary results of a multicenter French study based on the use of the Double Pass Image Analyser (OQAS) for the potential diagnosis of cataract, on a standardized questionnaire of life and taking also account the integrity of ocular surface in addition to visual performances. The key parameter provided by this platform is the OSI (Ocular Surface that increases when scatters are in elevation (superior to 4). Our preliminary pilot results show a significant correlation between quality of life and OSI changes, suggesting that the objective measurement of light scatter might be of interest for detection of early cataract and that the consideration of quality of life (based on a basic questionnaire) should be considered in the modern new definition of cataract.

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