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cellioThis morning at my ophthamologist's office, through the collection of lens parts that she used to mock up a new glasses prescription for me, I read a letter from the 20/30 line. I have never done that before. Woot! Yeah, office conditions are probably optimized compared to real life, but even if the raw numbers don't matter the deltas should. And yeah, it's only one letter, but it still passed a threshold. (If I understand correctly, this would mean a rating of 20/38 on that single test.)
Now if I can just find an optician to correctly make them for me. I had rotten luck with that last time around. (The guy I used before those guys was excellent -- but he retired, which is why I went to someone else.) Locals, any recommendations? I have a complicated, finicky prescription and complicated, finicky needs on things like the precise placement of the bifocals. I need someone skilled and detail-oriented who (1) is that scrupulous about what comes back from his lab and (2) can work with me on this. I recognize that this is a non-standard level of service for which one should expect to pay extra. (I would also like someone to advise me on frame shape to optimize my vision; most places want to optimize their bottom line or some sense of "fashion".)
Bonus points for proximity to either Squirrel Hill or South Side Works, because even if he is excellent I'll probably have to make a couple extra trips as part of this. My glasses just don't happen as one-shots. So running up to, say, Cranberry at lunch time (because places aren't open at 8:30AM) would be a challenge, though doable if absolutely necessary.
I don't know what most of this actually means, but:
OD: sphere +8.75, cylinder -2.00, axis 135, add power +3.75
OS: sphere +6.50, cylinder -2.50, axis 45, add power +3.75
Now if I can just find an optician to correctly make them for me. I had rotten luck with that last time around. (The guy I used before those guys was excellent -- but he retired, which is why I went to someone else.) Locals, any recommendations? I have a complicated, finicky prescription and complicated, finicky needs on things like the precise placement of the bifocals. I need someone skilled and detail-oriented who (1) is that scrupulous about what comes back from his lab and (2) can work with me on this. I recognize that this is a non-standard level of service for which one should expect to pay extra. (I would also like someone to advise me on frame shape to optimize my vision; most places want to optimize their bottom line or some sense of "fashion".)
Bonus points for proximity to either Squirrel Hill or South Side Works, because even if he is excellent I'll probably have to make a couple extra trips as part of this. My glasses just don't happen as one-shots. So running up to, say, Cranberry at lunch time (because places aren't open at 8:30AM) would be a challenge, though doable if absolutely necessary.
I don't know what most of this actually means, but:
OD: sphere +8.75, cylinder -2.00, axis 135, add power +3.75
OS: sphere +6.50, cylinder -2.50, axis 45, add power +3.75
The Add
Date: 2008-07-24 05:34 am (UTC)Re: The Add
Date: 2008-07-24 05:45 am (UTC)OS +4.00 DS add +6.00
Re: The Add
Date: 2008-07-24 01:13 pm (UTC)Re: The Add
Date: 2008-07-25 01:07 am (UTC)The numbers BTW are in diopters == 1/focal length in meters. The higher the number, the shorter the focal length.
+6.00 = 16.67 cm or 6.56"
For a + number you can create a real image by holding the lens between a light source and a surface and moving the lens until it focuses the image of the source. Measure the distance and you can compute the diopters. Negative numbers are a bit harder as the image is "virtual" and best measured using another lens -- or a laser and measuring the exit angle.
Sphere = is for spherical as in the surface of a simple lens (+ is convex, - is concave.) Cylindrical is as if a cylinder was sectioned length wise and placed on the lens, and axis is the angle of the cylindrical axis. The cylinder creates distortion (like a fun house mirror) that hopefully corrects the distortion of the eye.
Terry is so astigmatic that he was 30 before they discovered his vision was correctable. He was having an eye exam and the dr. stopped while spinning the dial and Terry said STOP! The dr said you can't possibly see through that! His vision went from 20/80 to 20/30 in one fell swoop and he was able to get a drivers license.