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Effects of contact and non-contact laser photocoagulation therapy on ocular surface in patients with proliferative diabetic retinopathy
Abstract
The aim of the study is to evaluate the effects of contact and non-contact laser photocoagulation (LP) on ocular surface changes and Ocular Surface Disease Index (OSDI) score in patients with proliferative diabetic retinopathy (PDR). This was a single center, prospective, randomised, parallel-controlled trial of pilot study in Hospital Universiti Sains Malaysia between June 2013 and May 2014. Eye with PDR was selected and randomised into 2 groups (Contact LP group and Non-contact LP group) by using random sampling envelope method. Contact LP group was treated with contact LP via slit lamp laser delivery system. Non-contact LP group was treated with non-contact LP via binocular laser indirect ophthalmoscopy system. Main outcome measures were Schirmer test value, tear film break-up time (TBUT) and OSDI score at baseline and at 3 months post laser therapy. Statistical analyses were performed using SPSS version 22.0. A total of 60 eyes were recruited (30 eyes in Contact LP and 30 eyes in Non-contact LP). Contact LP showed significant reduction of TBUT (p = 0.038) and significant increase in mean OSDI score (p = 0.001) at 3 months post laser therapy. However, there was no significant difference of mean change of Schirmer test value and TBUT between the two groups except for OSDI score (p = 0.044). Both mode of laser deliveries (contact LP and non-contact LP) showed comparable effects on ocular surface disease in PDR patient that underwent laser pan retinal photocoagulation.
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