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A. Hagiwara, K. Ogata, K. Oomachi, T. Sugawara, S. Yamamoto; Contrast Visual Acuity of Retinitis Pigmentosa Patients After Cataract Surgery. Invest. Ophthalmol. Vis. Sci. 2010;51(13):1361.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the standard visual acuity and visual acuity with different contrast targets in patients with retinitis pigmentosa (RP) after cataract surgery.
Nine eyes of eight patients with RP (3 men and 5 women) who underwent cataract surgery and implantation of a yellow intraocular lens were examined prospectively. The average age was 59.8±13.9 years. The best-corrected visual acuity (BCVA) in logMAR units, and the visual acuities under photopic and mesopic conditions with 100% and 10% contrasts were measured (CAT-CP, NEITZ) before and after cataract surgery.
Under photopic conditions, the mean BCVA improved from 0.57 to 0.31 logMAR units (P=0.002), from 0.73 to 0.47 logMAR units with100% contrast (P=0.029), and from 1.1 to 0.8 logMAR units with10% contrast (P=0.006). Under mesopic conditions, the BCVA improved from 0.87 to 0.59 logMAR units with 100% contrast (P=0.02), but no significant improvement was found with 10% contrast (P=0.18). The mean improvement of the BCVA (0.26 logMAR units), both the 100% contrast BCVA under photopic (0.26 logMAR units) and mesopic conditions (0.28) vision and 10% contrast BCVA under photopic (0.3) were not significantly different. The improvement of the BCVA with the 10% contrast under mesopic conditions was significantly weaker (0.12) than that of others.
The BCVA,100% and 10% contrast visual acuity under photopic conditions and 100% contrast visual acuity under mesopic vision were significantly improved in patients with RP after cataract surgery with approximately the same degree of improvement . The lack of a significant improvement with 10% contrast under mesopic conditions was probably because of the disruption of the rod photoreceptors in RP patients.
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