Hi, about 3 weeks ago I noticed a darker patch in the centre of my vision, though sometimes it looked more like a ring shape than a blotch. I thought this might be a scotoma, but I'm too young for Age-related Macular Degeneration (I'm 22) and I would've thought that 3 weeks is too long for an optical migrane.
I've also noticed a flickering in the centre of my vision. I thought that it might just be the odd wave patterns that I've occasionally seen since I was a child (I would see them sometimes when looking at a bright blue sky or another blank colour, and by that I don't mean the sun), but this is in the centre and thus more prevalent. It sometimes appears as a flashing light, and is there in some form 24/7 even when I close my eyes.
I've been tested with an Amsler Grid (both at home and at an Opticians) and I can see all of the lines fine and they aren't curvy. The only time I've had trouble with the Amsler Grid is when testing with a white-on-black one and looking at it in the dark, the dark patch would slightly cover the white spot. Though some medical sources say that the tests should be done in good lighting (and indeed the one at the opticians was)
I went to the local opticains and they said that my eyes were fine. Afterwards I went for an eye test at the hospital eye clinic and they said that they could see something near the macular but they weren't sure exactly what it meant, and the test which uses a laser to scan the rear texture of the eye came out fine.
I'm very worried if it'll get worse causing me to be unable to read. :(