Table 5.

Repeatability of measurements of the subfoveal photoreceptor outer segment layer made manually on images from spectral domain OCT in healthy volunteers and in patients with diabetes, diabetic retinopathy, or diabetic retinopathy with macular edema.

Group	Number of eyes with measurable 1st and 2nd images	SD of differences between 1st and 2nd images (μm)	Repeatability coefficient (μm)
Healthy	60	0.8	1.6
Diabetes without retinopathy	36	2.0	3.9
Diabetic retinopathy	27	1.6	3.1
Diabetic macular edema	33	2.9	5.7

Abbreviations: SD, standard deviation; μm, micrometer.