#1 ·
About nine months ago, my mother suffered a sudden loss of vision due to a pituitary tumor pressing against her optic nerve. She underwent surgery to remove the tumor after just a few days, and for a month or two, her sight began to gradually recover. However, that improvement lasted only about sixty days before she started experiencing this bizarre, cyclical alternation between light and dark days... It happens precisely at 2:00 AM every night—this shift where her visual field flips from light to dark. On the "light" days, her eyes are flooded with an overwhelming amount of white, whereas on the "dark" days, everything is dominated by heavy blacks and browns. Currently, because of these alternating veils of light and shadow, her functional vision is down to about 15%. Interestingly, when she closes her eyes and then opens them, she sees a perfectly clear image, but it only lasts for maybe three or four seconds before the light or dark curtain descends again, depending on the day. It is particularly distressing for her when she steps out into bright sunlight; the dark veil appears instantly. The same thing happens whenever she is near an LCD television or any bright white light source. We have consulted numerous ophthalmologists and neurologists, yet none of them could provide a definitive explanation for these phenomena. If anyone here possesses any insight or has encountered something similar, I would be deeply grateful for your help.