Sir,

The early treatment diabetic retinopathy study (ETDRS)1 showed that macular grid and focal laser therapy reduces the risk of moderate visual loss in diabetic eyes with clinically significant macular oedema (CSME). Although this treatment may not benefit every patient, side effects are fortunately uncommon. Reduction of visual acuity following treatment infrequently occurs because of subfoveal choroidal neovascularisation, subretinal fibrosis, macular haemorrhage and areas of capillary nonperfusion in continuity with the foveal avascular zone (FAZ).

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