Table 5 Criteria utilising spectral domain optical coherence tomography (OCT) as an adjunct to colour fundus photography in diabetic eye screening surveillance clinic

From: Action on diabetic macular oedema: achieving optimal patient management in treating visual impairment due to diabetic eye disease

OCT positive criteria:

 The presence of subretinal fluid or diffuse retinal thickening or intraretinal cystoid spaces associated with a change in the internal limiting membrane (ILM) or foveal contour

 The presence of intraretinal cystoid spaces and associated with:

A drop in visual acuity (VA) to ≤6/12; or

With a large area of greater than 1 disc area of fluid the edge of which is within 1 disc diameter of the central fovea

 Retinal thickness in the foveal central subfield ≥300 μm

OCT borderline criteria:

 The presence of intraretinal cystoid spaces, or subretinal fluid, without any change in the ILM contour, and foveal central subfield ≤300 μm in the central 1 mm macular subfield

 With VA ≥6/9

 Without a large area of leakage of greater than 1 disc area the edge of which is within 1 disc diameter of the central fovea

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