Shrooms actually help with visual acuity (at least according to Terrence McKenna). I recall him saying it in a talk. His 'stoned ape' theory suggests that people used to take shrooms before hunting to give them an unfair advantage.
I think sometimes people manage high hand-eye performance under the Serotonin 2A trip, but a person "tripping balls" probably has their irises opened by the drug effect, causing a little blur to begin with and then some pattern matching PLL goes haywire causing the walls to breathe and at higher doses you might see a lot of geometry and lines that aren't there or the flowers are blooming and spraying you with sex energy and you'd better run...
At that point you are not experiencing better visual acuity -- half an hour or a day later, however, the story might be different.
There is a clinic in Israel that publishes record numbers of case reports about young people who took L.S.D. or such and now they perceive things differently so they are exempt from the draft. I think they are a bunch of quacks and malingers unlike the town in Poland where the drunks discovered that 1-propanol and 1-butanol are possibly safe and certainly more cost effective than 1-ethanol; reports from the e-room confirm the toxicity is similar to that of ethanol.
