When ordering contacts What is power?

The ‘Power’ or ‘Sphere’ section of your prescription indicates how much correction your vision needs to function properly. This is sometimes written as PWR/SPH or just PWR. This will be given in the form of a number, which will have a minus or plus sign preceding it.

How do I choose contact lens power?

You’ll find that the cylinder number on a contact lens prescription is always a minus number. This indicates the extra power you need for astigmatism correction. A higher number denotes a more severe level of astigmatism. The cylinder value for a glasses prescription on the other hand can be a plus or minus.

How do you know what prescription you need for contacts?

You can find your prescription on the piece of paper given to you by your optician during a check-up, on the end/side of your contact lens box or on the blister packs that contain your contact lenses.

Is there a power limit for contact lenses?

Extended-range contact lenses are available in spherical powers up to -20.00D for short-sightedness and +15.00D for long-sightedness, as well as up to cylinder power -5.75D for astigmatism.

What is the strongest contact lens prescription?

If not, what is the maximum number of diopters for which a person would be able to wear contacts? A: Actually, almost all nearsighted people can wear contact lenses, no matter how high their prescription. In fact, there are contact lens laboratories that make custom lenses up to -30.00 diopters!

Is power the same as Sphere in contacts?

Sphere (SPH) – The term “sphere” means that the correction for nearsightedness or farsightedness is spherical, equal in all meridians of the eye. This indicates the amount of lens power, measured in diopters (D), prescribed to correct nearsightedness or farsightedness.

How do I find out my eye power?

A “plus” (+) sign in front of the number means you are farsighted, and a “minus” (-) sign means you are nearsighted. These numbers represent diopters, the unit used to measure the correction, or focusing power, of the lens your eye requires. Diopter is often abbreviated “D.”

Can you get contact lens prescription online?

You need a smartphone, a computer, and 10 feet of space. After the test, a doctor will review your answers within 24 hours and a PDF of your valid prescription will be sent via email. If you place an order before taking the test, the order will be processed faster. However, an order is not required to take the test.

What prescription is too high for contacts?