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Medical Forum / General / Vision / April 2004Developing stereopsis?
Just a quick question: is there any evidence to suggest that it is possible to develop stereopsis in a person who, from birth, has never had stereopsis? Gareth. > Just a quick question: is there any evidence to suggest that it is possible > to develop stereopsis in a person who, from birth, has never had stereopsis? > > Gareth. And a short answer, no Jan (normally Dutch spoken) > Just a quick question: is there any evidence to suggest that it is possible > to develop stereopsis in a person who, from birth, has never had stereopsis? After age 9 or 10 it's unlikely, and the likelihood decreases with each year after. -MT > > Just a quick question: is there any evidence to suggest that it is possible > > to develop stereopsis in a person who, from birth, has never had stereopsis? > > After age 9 or 10 it's unlikely, and the likelihood decreases with each year > after. Thanks. There seems to be conflicting information on this point: some research I've seen briefly cited suggests that surgery, to correct various types of squint, should be carried out within 6 months or so of birth if there's any reasonable chance of developing stereopsis. I've seen other suggestions which don't rule out useful surgery after a decade. Is there a consensus? Gareth. > There seems to be conflicting information on this point: some research I've > seen briefly cited suggests that surgery, to correct various types of > squint, should be carried out within 6 months or so of birth if there's any > reasonable chance of developing stereopsis. I've seen other suggestions > which don't rule out useful surgery after a decade. Is there a consensus? The consensus is that kids can do remarkable things when it comes to neurological rehabilitation, so don't waste any opportunities. We certainly don't stop trying at six months, because simultaneous vision and stereopsis can be improved through age 5-6 at least, once you fix the squint or remove the cataract, for instance. I don't think anyone questions the benefit of patching and binocularity training at those ages. -MT > > There seems to be conflicting information on this point: some research I've > > seen briefly cited suggests that surgery, to correct various types of [quoted text clipped - 9 lines] > remove the cataract, for instance. I don't think anyone questions the benefit of > patching and binocularity training at those ages. That's very interesting. Has there been any evidenced suggestion at all that it may be possible - however unlikely - to train adults to develop stereopsis? Gareth. > Has there been any evidenced suggestion at all that it may be possible - > however unlikely - to train adults to develop stereopsis? Not my area, but nobody sues for failing to treat binocular problems in adults. We generally regard the potential as zero around age ten but nobody discourages a teen or young adult from trying. Except to warn them about scam artists who promise what they can't deliver. -MT snip > Has there been any evidenced suggestion at all that it may be possible - > however unlikely - to train adults to develop stereopsis? > > Gareth. I once trained a woman with mild amblyopia and a small angle exotropia (surgery and amblyopia patching as child). She was in her early twenties and doing a Masters in Geography which required viewing stereo topographical maps. Unfortunately she did not have stereopsis. It took about 6 months of intensive therapy and prism reading glasses; we had to break down suppression, then build fusion. She saw double for a while in the middle. Very, very motivated patient as she wanted the degree, but at the end of it she said she would not continue to wear the glasses and was hoping to go back to alternate suppression. Dr Judy > snip > > Has there been any evidenced suggestion at all that it may be possible - [quoted text clipped - 11 lines] > she said she would not continue to wear the glasses and was hoping to go > back to alternate suppression. Thanks Mike and Dr Judy - your comments are very interesting. Out of curiosity, how do you break down suppression? Gareth. |
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