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       XXVI Annual Congress of the Iranian Society of Ophthalmology        بـیــست و ششمین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران
مقاله Abstract


Title: Photopic, Mesopic, and Scotopic Visual Acuity after 18mW/cm2 Accelerated Corneal Cross-linking
Author(s): Soheila Asgari PhD, Hassan Hashemi MD, Mohammad Miraftab MD, Saied Shahhoseini MD, Ebrahim Jafarzadhpur PhD, Shiva Mehravaran MD MIH, Akbar Fotouhi MD PhD
Presentation Type: Poster
Subject: Cornea and Anterior Segment
Others:
Presenting Author:
Name: Hassan Hashemi
Affiliation :(optional) Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran; Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran;
E mail: research@noorvision.com
Phone: 02182401614
Mobile: 09121127421
Purpose:

One year changes in uncorrected (UDVA) and corrected (CDVA) distance visual acuity in different lighting conditions after accelerated cross-linking in patients with progressive keratoconus in comparison with the non-operated cases.

Methods:

In this Non-randomized clinical trial, fifty eyes were enrolled in the surgery group and 40 in the control group. Visual acuity was tested under photopic (100 lux), mesopic (20 lux), and scotopic lighting conditions at 6 months and 1 year.

Results:

Age adjusted changes in all studied variables were similar in the two groups (all P>0.05), but the 0.02±0.17 logMAR reduction in scotopic UDVA in the surgery group showed a difference of borderline significance compared to the control group (P=0.061). In cases with baseline UDVA?20/40, one year adjusted results in the surgery and control groups were respectively 0.61±0.34 and 0.83±0.35 logMAR for photopic UDVA (P=0.021), 0.48±0.22 and 0.68±0.27 logMAR for mesopic UDVA (P=0.033), and 0.21±0.14 and 0.26±0.07 logMAR for mesopic CDVA (P=0.056). In those with baseline UDVA>20/40, one year adjusted results in the surgery and control groups were respectively 0.12±0.20 and 0.06±0.10 logMAR for mesopic UDVA (P=0.034) and 0.15±0.18 and 0.07±0.06 logMAR for scotopic UDVA (P=0.024). Inter-group differences were not significant with other vision indices (all P>0.05).

Conclusion:

After cross-linking, in keratoconus cases with low vision, it is more likely to achieve improved vision or a halt in its deterioration. For cases with good vision, however, further impairment of photopic vision is halted, but they may experience worse vision under mesopic and scotopic conditions.

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