My letter gives me the following information:
Right:
Power -0.75
BC 8.70
Cyl -0.75
Axis +80.00
Left:
Power -1.00
BC 8.70
Cyl -0.75
Axis +70.00
And also how do we find the "20/20" measurement of our sight?
2007-10-30 04:43:38 · 4 answers · asked by Jonathon 1 in Health ➔ Optical
You are a little near-sighted with a little bit of astigmatism. The BC is the curvature of your eye (cornea). The 20/20 comes from a really weird calculation that sounds really stupid. Basically, if you can see 20/20 and I can see 20/40, you can see something clearly at 40 feet and I have to be 20 feet from it to see it as clearly. My vision is less than 20/400 (without glasses). That means that you can stand 400 feet away from something and I can stand 20 feet away and we both see it the same. (Very blurry) You are probably about 20/25 or 20/30 without your lenses.
2007-10-30 09:57:57 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Power is for nearsighted/farsighted correction
Cyl is for astigmatism correction
Axis is just that-tells the optician what axis to set the cyl at
BC is the curvature for contact lenses
Your sight with the correction you listed should be 20/20-ask your doc what your visual acuity is without correction
Also visual acuity like 20/40 means that something a person with 20/20 sight can see at 40 feet, you can see at 20 feet.
Hope this helps
2007-10-30 13:15:28 · answer #2 · answered by dee_dee 2 · 1⤊ 0⤋
contact lense prescription
2016-02-03 17:04:45 · answer #3 · answered by Courtney 4 · 0⤊ 0⤋
The power, cyl and axis specify the power of the contact lens, the BC is the curvature of the back surface. A contact lens prescription should also specify a brand of lens, type of material and diameter of lens.
You have to ask your eye doctor for your "20/20" measurement, it can't be calculated from lens power.
2007-10-30 05:18:47 · answer #4 · answered by Judy B 7 · 1⤊ 0⤋