![]() The macula is defined as the part of the retina which lies within a circle centred on the centre of the fovea. Assign a P1 grade if evidence of previous photocoagulation (focal/grid to macula or peripheral scatter). 1.5 Photocoagulation scarsĪssign a P0 grade if no evidence of previous photocoagulation. 1.4 Venous loopsĪ venous loop should no longer be referred and should be regarded as a feature of R1. Where CWS are detected, graders should ensure they have checked for features of referable DR – in particular IRMA and early venous beading. Isolated cotton wool spots (one or more) in the absence of any microaneurysm or haemorrhage should be counted as no DR (R0).Īny number of cotton wool spots ( CWS) in the presence of other non‐referable features of DR should be graded as background DR (R1). Intraretinal microvascular abnormality ( IRMA) should not be recorded unless visible on colour images, without enlarging the image area, in addition to red free images. Microaneurysms should be differentiated from pigment spots by viewing in colour and red free and from artefacts by viewing on overlapping images where possible. This includes:Īvoiding excessive enhancement of images (beyond scale of 1:1) Equipment should meet national specifications and used in line with recognised procedures for grading. Grading should be carried out in accordance with national guidance. There are FBG forms for routine digital screening, digital surveillance ( DS) and slit lamp biomicroscopy ( SLB) surveillance.
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