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Medical Forum / General / Vision / October 2004Vision Problem - Going Dark
Sitting in my living room watching TV, after about 15 minutes something went wrong with my vision, made me think I was either having a stroke or going blind. As I casually sat in my chair in semi-darkened room watching TV about 15 feet away, all of a sudden my vision (except the tunnel focus to TV) starting going DARK. I thought I was having a stroke, blood was pouring into my eyes, the visitation of an angel coming. I blinked a bit and the room lightened back up --my vision normal. Here is what I think happened: I believe that my irises merely contracted (to near closure). As the irises pinched down, it had the effect of narrowing my field of vision down to the central tunnel. I am 50, normal health, somewhat low blood pressure. Am I going blind? If this is a problem where my iris wants to stay fairly shut (that is: small in size), what disease might cause this? What supplement might bring this effect upon me? What can I take to normalize my irises --that is, sufficiently opened to take in enough light? > Sitting in my living room watching TV, after about 15 minutes something went > wrong with my vision, made me think I was either having a stroke or going [quoted text clipped - 13 lines] > What can I take to normalize my irises --that is, sufficiently opened to take > in enough light? I think you should be seeing a doctor, instead of sitting on the computer, > Sitting in my living room watching TV, after about 15 minutes something went > wrong with my vision, made me think I was either having a stroke or going [quoted text clipped - 13 lines] > What can I take to normalize my irises --that is, sufficiently opened to take > in enough light? It's probably not your irises, more likely something to do with the blood suppply to your eyes or optic nerves. Could be the low blood pressure, could be something else. Have an eye check and also a general health check. Dom > merely contracted (to near closure). As the irises pinched down, it had > the > effect of narrowing my field of vision down to the central tunnel. Your vision doesn't narrow to a tunnel when you stand in bright light, does it? The iris is at a point in the light path where it reduces the overall intensity without "vignetting" or creating a tunnel. The aperture (f-stop) in a 35 mm camera works the same way. Much more likely that your blood pressure just dropped momentarily. People describe this "tunnel" effect when they faint. > What can I take to normalize my irises --that is, sufficiently opened to > take > in enough light? Your pupils work fine; they don't need "normalizing". -MT > I am 50, normal health, somewhat low blood pressure. Am I going blind? If this > is a problem where my iris wants to stay fairly shut (that is: small in size), > what disease might cause this? What supplement might bring this effect upon me? > What can I take to normalize my irises --that is, sufficiently opened to take > in enough light? You forgot to tell if you use eyeglasse, contacts, sunglasses, lasik or other things like that... > As I casually sat in my chair in semi-darkened room watching TV about 15 > feet away, all of a sudden my vision (except the tunnel focus to TV) > starting going DARK > I blinked a bit and the room lightened back up my vision normal. This sounds fairly normal to me. As I recall, the rod photoreceptors will, basically, shut down after awhile when presented with unvarying illumination (such as when you stare at a still background). Blinking or motion "resets" the receptors (and startles the hell out of you if it's the cat jumping on your lap...or a lion moving in your peripheral vision while you're foraging for food). Since it's rod-specific, the effect is generally only noticable in semidarkness, and then only if you stare unblinking in one direction for a considerable amount of time. As a kid I used to play with this at night, staring at a wall or ceiling until things started to fade out. Try as I might, I could never manage to get a complete blackout before I absolutely had to blink. That's not to say you shouldn't see a doctor, of course. If the effect has suddenly become noticable (or happens a lot), it might be symptomatic of a receptor problem.  SignatureIf you can see the FNORD, remove it to reply by email. > As a kid I used to play with this at night, staring at a wall or ceiling > until things started to fade out. Try as I might, I could never manage to > get a complete blackout before I absolutely had to blink. How is your vision now? >> As a kid I used to play with this at night, staring at a wall or ceiling >> until things started to fade out. Try as I might, I could never manage to >> get a complete blackout before I absolutely had to blink. > >How is your vision now? My vision seems fine. My blood pressure is low but supposedly healthy. I had a comprehensive blood analysis. Everything normal, though my blood is a bit thin. Hematocrit of 31 is marginally low, hemoglobin just a bit low. My dissolved Oxygen is 99 percent, which is great though. I did not go see an eye (or any other) doctor. I have not had a recurrence of the darkening vision while watching TV, but I have not much watched TV for a couple weeks. You could have just been watching "Dark Shadows," "Darkman," "Dark Horse," or any of the Batman movies. Does the TV talk to you when it is turned off? > >> As a kid I used to play with this at night, staring at a wall or ceiling > >> until things started to fade out. Try as I might, I could never manage to [quoted text clipped - 8 lines] > other) doctor. I have not had a recurrence of the darkening vision while > watching TV, but I have not much watched TV for a couple weeks. Take a specimen of very fine print and tell me size of type, and distance, in good light, from your near and remote point from your nose, thanks. I suppose you do not need eyeglasses. |
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