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Medical Forum / General / Vision / April 2006BIOMEDICS 55 lens question
I had worn a biomedics 55 lens at -5.75 strength. Since it was too weak, I went to the optometrist who offered Ia -6.00 which was still slightly weak. She said the Biomedics 55 then goes to -6.50 (skipping -6.25). This is a 'spheric' lens and it's good, but I find it almost a tad too strong. Is there a reason why biomedics does not produce a lens at -6.25 ? Karen > slightly weak. She said the Biomedics 55 then goes to -6.50 (skipping > -6.25). This is a 'spheric' lens and it's good, but I find it almost a > tad too strong. Is there a reason why biomedics does not produce a lens > at -6.25 ? Karen Economy, mostly, determined by the bell-shaped curve of people wearing contacts. Other companies like Vistakon do the same thing. Ciba and B&L offer -625, -675 etc in some of their lenses. -MT many companies go by half diopters starting at -6 because few people can tell the difference between .25 diopters and also not many people have such bad vision so it would cost the company too much to make contacts in .25 diopter steps all the way to -10 or -12. How well do you see with -6 contacts? If your seeing 20/20(unless you cant be corrected to that) its the right power. Otherwise use -6.5 then.
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