Questions and debates about blindness:

Hear Again said:
how is it that progressive bifocals make someone dizzy but standard bifocals don't when the latter forces a person to look above and below the "line?"
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Because of the gradual change in power, if you move your head from side to side or up and down, the progressives have a way of making things look bigger then smaller then bigger then smaller, which makes them look like they're going in and out, in and out. This can have a dizzying effect.

When you have a separate bifocal embedded in the distance lens, then there is a clear point where the lens changes from one power to the other. Also these bifocal lenses are cut in a half-moon shape, because if you look far enough to the left or right, then one eye is looking at your nose, so the bifocal isn't needed at the very outsides of the lower portion of the lens. With the progressives, they need more room to make the power gradual, so the bifocal often extends farther out in the lower portion of the lens.

If that doesn't make sense, please forgive me. I'm not very good at explaining these kinds of things.
 
typeing, do you want to try and explain? I tend to only confuse and not clarify when trying to explain technical stuff.
 
does anyone know of a good website on the net that explains this in simple terms?
 
Nika said:
For those of you who don't know what an ERG is like...

It's like having a contact lens fitted onto your eye that is hooked up to some machine thing. And the contact lens isn't like a regular lens--it has two acute angles that sort of pinch on your eye. It's just the worst all around. And you have to stay like that for a long time, too. <shiver>
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Thanks for explaining.
No I've never had that done.
 
dreama said:
Why? Since you were born totally blind what would be the point of that?
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Ophthalmologists also have to take care of conditions like eye pain or dry eyes in addition to caring for the patient's vision.
 
Nika said:
Ophthalmologists also have to take care of conditions like eye pain or dry eyes in addition to caring for the patient's vision.
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...and i have dry eye and a history of eye pain that wasn't diagnosed as migraines until i was 17.
 
Hear Again said:
...and i have dry eye and a history of eye pain that wasn't diagnosed as migraines until i was 17.
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I was just wondering. It just seemed odd. It seemed more then a routine check up and I was surprised that they would use it for someone who was obviously totally blind from birth.

I hope I haven't caused any offense.
 
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