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Medical Forum / General / Vision / December 2005Problem with the optometrist.
FIRST PROBLEM: I have strabismus in my left eye which seven operations have assuaged only slightly. Accordingly I am resigned to this condition which gives me a lazy left eye and a head rotation slightly to the left. How do I quantify this head rotation in degrees? Now that I require bifocals (the new borderless type) my optometrist seems incapable of understanding that the centrepoint of the glasses must account for my head rotation, and he seems to have no way of measuring this. How can I speak a language an optometrist can understand, and who should I speak to at the optometrists? Are there keywords familar to these people? SECOND PROBLEM: People with bifocals understand that to look upwards to read the title of a book on an upper shelf necessitates the bending of the head backwards to an ungainly degree to engage the lower part of the glasses. This is most boring. Is there such a thing as "tri-focals" which would be the same as bifocals but with the lower (stronger) lens duplicated in a thin stripe at the very top of the glasses? Perhaps snooker players would find these useful too. My optometrist has never heard of these! Please help, pecause I have to order a duplicate set of glasses soon. Regards, Peter heh may be time to find another optometrist if you know more than he does! > How can I speak a language an optometrist can understand, and who should I > speak to at the optometrists? I might say to him "Dot the near OC in habitual head position." This tells him to seat you in your reading position, in the new frame. He'd mark the spot in your new frame to place the center of the near addition, then adjust it to a standard decentration used by the optical lab. > SECOND PROBLEM: > People with bifocals understand that to look upwards to read the title of > a book on an upper shelf necessitates the bending of the head backwards to > an ungainly degree to engage the lower part of the glasses. > > This is most boring. Turn your glasses over. :) > Is there such a thing as "tri-focals" which would be the same as bifocals > but with the lower (stronger) lens duplicated in a thin stripe at the very > top of the glasses? In the US, these are called "occupational bifocals". There is a limited number of shapes and powers for the upper segment. > My optometrist has never heard of these! It's basic opticianry, but it's outside the experience of many beginners. Definitions of "optometry" vary. Graduate optometry programs include at least one course in occupational designs. -MT > SECOND PROBLEM: > People with bifocals understand that to look upwards to read the title of a [quoted text clipped - 6 lines] > but with the lower (stronger) lens duplicated in a thin stripe at the very > top of the glasses? > My optometrist has never heard of these! Perhaps these don't exist because they aren't realistic? Trifocals are very common. I've known many people who wear these. My father is totally dependent on them. However, the top is for the distance, the middle is for the middle, and the bottom is for near. That's how most people see. Those who use computers a lot have a different need. It is very important to match the glasses to what you usually do. If you spend several hours a day looking at the upper shelf, you need to get glasses that work for that. If you are like most of us, and spend a few seconds per week doing that, just tilt your head. YMMV.  SignatureDan Abel dabel@sonic.net Petaluma, California, USA >> SECOND PROBLEM: >> People with bifocals understand that to look upwards to [quoted text clipped - 19 lines] > > Those who use computers a lot have a different need. Actually I was thinking about an inverted bi-focal... (maybe even tri). I want tri-focal translating contacts. Great. Fused Kontacts makes them. Down side is that the center segment can only be from 1 mm to 1.5 mm tall. I use the computer a lot and the field of view through that is a bit narrow vertically. Ideally I would have liked the top center segment larger and the bottom segment very narrow since I do infrequent paper reading or close work. So... what I was thinking was tri-focal contacts with inverted tri-focal computer glasses that would optimize all three segments (or maybe just the bottom two) for computer distance... I thought it was a tremendous idea but it was a bit too far out in left field for my OD to seriously consider as a first option. -:) -Quick Thanks for all replies - except the first. The optician should be able to handle both issues just fine. THis is assuming that you live in a licensed state where an optician has to have at least a very basic concept of optics and fitting issues such as yours. Mentioning your condition and the fact that you have your head tilted slightly when reading normally should clue the optician in if they haven't already noticed from talking to you and watching your head movements. You can request that the centers be spotted according to habitual head position. 2nd Issue: You are vaguely describing double D occupational bifocals. THe drawback is that the separation is between 11 and 14 mm so the distance correction is pretty tight between the two near segments. A trifocal with a top near or intermedaite segment is called a quadrafocal. Material availability for either lens is very limited and some places can't even get them so check around if this really interests you. Carl > FIRST PROBLEM: > I have strabismus in my left eye which seven operations have assuaged only [quoted text clipped - 30 lines] > Please help, pecause I have to order a duplicate set of glasses soon. > Regards, Peter |
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