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is it okay to convert my glasses prescription to my contact lens prescription

A 42-year-old member asked:
Dr. David Kira
20 years experience Ophthalmology
Not really: The contact lens rx is determined from a refraction for glasses - sometimes trial fitting is necessary since the actual numbers are different due to a ... Read More
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A 49-year-old member asked:
Dr. Richard Bensinger
51 years experience Ophthalmology
Slightly tricky: Mostly straightforward if there is no astigmatism but a little involved if there is astigmatism. I assume you are ordering lenses online and will nee ... Read More
A 50-year-old member asked:
Dr. Richard Bensinger
51 years experience Ophthalmology
Close: Commonly it is slightly higer like -4.50 and -5.00 but this depends in part on the goal and how long since your last examination. Also at your age t ... Read More
A 47-year-old member asked:
Dr. David Kira
20 years experience Ophthalmology
Yes: It is due to a differing vertex distance or where the corrective lens is placed in relationship to the corneal surface - this is normal.
A 35-year-old member asked:
Dr. Andrew Shatz
25 years experience Ophthalmology
Yes: Especially if you are very nearsighted or farsighted, your contact lens and glasses should have different prescriptions. The optics behind this phenom ... Read More
A 47-year-old member asked:
Dr. Howard Pomeranz
27 years experience Ophthalmology
Distance from cornea: Contacts sit directly on the cornea so their magnification power is different than lenses in glasses that are in front of the cornea.
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A 56-year-old member asked:
Dr. Tim Conrad
33 years experience Ophthalmology
No: The glasses prescription is a necessary piece of information to determine a contact lens prescription. But there is more to it than that.
A 42-year-old member asked:
Dr. Ari Weitzner
32 years experience Ophthalmology
Naah: Usually a little different, especially as the prescription number gets higher. Also, you have to be fitted with a right fit, not just prescription pow ... Read More
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A 40-year-old member asked:
Dr. Robert Chang
Specializes in Ophthalmology
No: An estimation can be made for the power of the contact lens, but the base curve and diameter have to be fitted to your eye. Thus, typically a trial l ... Read More
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A 47-year-old member asked:
Dr. Robert Chang
Specializes in Ophthalmology
Not correct: Eyeglasses and contacts lens prescriptions are not the same. There is a power difference since the glasses are farther from the cornea surface compar ... Read More
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1 thank

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