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

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