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Is 4.25 A strong prescription?
If your number is between -0.25 and -2.00, you have mild nearsightedness. If your number is between -2.25 and -5.00, you have moderate nearsightedness. If your number is lower than -5.00, you have high nearsightedness.
Is it bad to wear too strong contacts?
It doesn’t happen often, but if an error was made in your contact lens prescription and you are wearing lenses that are too strong, too weak or otherwise incorrect, this could cause eye strain and headaches. If this is the cause, replacing the lenses with contacts of the correct power should eliminate your headaches.
What is considered a strong lens prescription?
If you are -4.25, that means you have 4 and 1/4 diopters of nearsightedness. This is more nearsighted than -1.00, and requires stronger (thicker) lenses. Similarly, +1.00 would be a small amount of farsightedness and +5 would be more.
How do I know if my contact prescription is too strong?
When your prescription is too high, you will notice that you begin to feel dizzy and nauseous within some time of wearing your prescription glasses or lenses. This is a sure indication of a wrong prescription.
What happens if I wear contacts with the wrong base curve?
You should never order contact lenses with a base curve that is different from your prescription. This can damage your eyes and cause problems with vision. This is especially important for people who purchase cosmetic coloured contact lenses, which are often of a standardised size.
How do I choose the right contact lenses for me?
Different contact lens companies make lenses in various strengths. Your doctor can determine which lens is best for your eyes and whether custom lenses can be prescribed in a higher strength. In the near future, contact lenses may be made with higher strengths and other capabilities.
Do contact lenses make you less nearsighted?
Since eyeglasses are usually about 12 millimeters from the eye, the prescriptive power of a contact lens — which is positioned directly on the tear film of the eye — will be slightly less nearsighted. This becomes significantly different with prescriptions of 4D or greater.
Why do I need to try on two different contact lenses?
Sometimes it is necessary for your eye doctor to have you try on both in order to determine which one helps you see best. A note about ‘Cylinder’: If you have ‘Cylinder’ in your contact lens prescription, you will need to be fitted with a contact lens ‘for astigmatism ‘, also sometimes named ‘toric’ contact lens.
Do I need a prescription after a successful contact lens fitting?
You should be given a prescription after a successful contact lens fitting. If you weren’t given a prescription, in Ireland, it’s your legal right to have a copy, so don’t be afraid to ask your optician for it.