You're saying that the retinologist has pictures of retinas, or that they have pictures of vision as seen with those retinas??
The only diabetic retinopathy vision simulation that I'm aware of on the internet is at
ftp://ftp.nei.nih.gov/sims/dret_l.tif . Based on this, I would assume that when diabetric retinopathy occurs, it produces irregularly shaped areas of blackness in one's visual field, and furthermore, that these areas have relatively discrete (but not sharp) boundaries.
Building a simulator that would allow people to place areas of blackness inside a picture is easy to do.
But there are certain issues associated with its construction...such as...
1. The edges to the black areas...are they always as discrete as shown at the NEI link, or does the black area sometimes just slowly fade out, perhaps indicating more diffuse cellular damage?
2. Do the black areas just suddenly pop up overnight, or do they appear as translucent gray spots, and then grow in size and opacity, perhaps indicating the gradual death of retinal receptors associated with that area of vision?
3. Do the black areas appear in certain predictable pattern for each person, perhaps indicating that the fine capillaries which rupture have a certain consistent anatomical structure from individual to individual?
4. Are the spots always black, or are they sometimes red, like blood is red?
Thanks,
Roger
Belinda
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