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Doctor insights on: Can You Explain Why My Contact Lens Dioptry Is Higher Than My Glasses Dioptry

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Can you explain why my contact lens dioptry is higher than my glasses dioptry?

Can you explain why my contact lens dioptry is higher than my glasses dioptry?

Contacts: You are far-sighted. The contact lens sits on the eye; glasses sit on the nose. The distance from the contact lens to the center of the eye is closer than the distance from the glasses lens to the center of the eye. Thus, for a far-sighted person, the lens power must be greater for the contact lens to achieve the same effective correction as the glasses. ...Read more

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Diopter (Definition)

The diopter is a term used in optics to measure the ability of a lens or mirror to bend light (one diopter is the displacement of one cm at a distance of one meter). Eyeglasses and mirrors are measured in this unit. It is not the snellen fraction (20/20 ...Read more


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My glasses are( -) 4 diopter. I m now 40. Howcan i improve my eyesight? Now i started feeling that ability to read nearby things also reducing.

My glasses are( -) 4 diopter. I m now 40. Howcan i  improve my eyesight? Now i started feeling that ability to read nearby things also reducing.

No problem!: You are near sighted (myopia). This is not a problem, but if you want to see better for far and near, you will need glasses, contacts, or possibly consider lasik. ...Read more

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No matter what i do. Wear glasses or contact lens my vision is not perfect..What is going on?

No matter what i do. Wear glasses or contact lens my vision is not perfect..What is going on?

Need MD exam: If you have not had a medical eye exam performed by an ophthalmologist, you need one. You may have an undelying medical eye condition limiting your best corrected vision. You need to get more information about your eye. ...Read more

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Is it okay to convert my glasses prescription to my contact lens prescription?

Is it okay to convert my glasses prescription to my contact lens prescription?

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 an optical property called vertex distance. ...Read more

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Why is my contact lens and glasses prescription different?

Numbers game: Fitting cl is an art form as much as science. When the eyeglass refraction is placed in a cl if the number is large enough the strength of the contact may be different to cause good vision. The fit can also change the numbers. These are called "fudge factors'. The numbers are not as important as the ability to see wella nd comfortably. ...Read more

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Could you tell me if my contact lens prescription is -4.00/-4.50 what is my glasses prescription?

Could you tell me if my contact lens prescription is -4.00/-4.50 what is my glasses prescription?

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 there is the issue of bifocals due to near vision needs. Useful to check with your ophthalmologist for the best information on this. ...Read more

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Is contact lens harmfull for eye for daily use if used instead of glasses?

Is contact lens harmfull for eye for daily use if used instead of glasses?

Not usually: Contact lenses that are used properly in a patient who is a proper candidate for their used will generally not be harmful. That's why so many millions of people successfully wear them. ...Read more

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What would you suggest I do to convert my glasses prescription to contact lens prescription?

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 need that conversion. There is also some experience functions depending upon the type of lens. Check with your ophthalmologist to get this done for you. Optometrists are unlikely to do it as they prefer to sell you lenses. ...Read more

Dr. Tim Conrad
346 doctors shared insights

Contact Lens Use (Definition)

A contact lens is a thin plastic or glass lens that is fitted over the colored part of the eye. It may be used for corrective, cosmetic, or therapeutic purposes. ...Read more


Dr. Tim Conrad
761 doctors shared insights

Glasses (Definition)

Glasses is a term that describes a pair of lenses that are placed in a frame to be worn to correct faulty vision ...Read more