Retinal photography is pretty much restricted to those who are having serious problems that require monitoring of the stability of the retina.
As an aside it's pretty interesting to have photo's like this taken because they take multiple pictures in rapid succession. Although that might not sound interesting, the bit that is interesting is that the rapid flashes deplete your eyes of the chemical compounds needed to see color. After the flashes you are momentarily (less than a second) blind, with black and white vision coming then color coming back slowly as your body recreates the chemicals used to see color (the first color you see is red so the first thing you see is a red/pink tinted world, it's quite trippy).
Don't try this at home BTW, the flashes used in retinal photography are different than those used in conventional flash photography, enough so that doing the same thing with a conventional flash could possibly damage your retina.
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Retinal photography is pretty much restricted to those who are having serious problems that require monitoring of the stability of the retina.
As an aside it's pretty interesting to have photo's like this taken because they take multiple pictures in rapid succession. Although that might not sound interesting, the bit that is interesting is that the rapid flashes deplete your eyes of the chemical compounds needed to see color. After the flashes you are momentarily (less than a second) blind, with black and white vision coming then color coming back slowly as your body recreates the chemicals used to see color (the first color you see is red so the first thing you see is a red/pink tinted world, it's quite trippy).
Don't try this at home BTW, the flashes used in retinal photography are different than those used in conventional flash photography, enough so that doing the same thing with a conventional flash could possibly damage your retina.