What do the numbers on my contact prescription mean?
The higher the number, the stronger the visual correction needed. Diameter (DIA): The diameter of the contact lens is also written in millimeters and determines the width that best fits your eye.
How do you read a contact lens prescription?
How to Read Your Contact Lens Prescription
- OD: Oculus dexter, the Latin term for right eye.
- OS: Oculus sinister, the Latin term for left eye.
- PWR: Power (also referred to as Sphere or SPH)
- BC: Base Curve (usually a number between 8 and 10)
- DIA: Diameter (usually a number between 13 and 15)
What does 3.50 mean in contacts?
If the symbol is a “-” then that indicates you have nearsightedness. A “+” symbol means that you have farsightedness. If for example, you had a prescription that read OD +3.50 and OS -2.00. Then you would have 3.5 diopters of farsightedness in your right eye and 2 diopters of nearsightedness in your left.
How do you read contact lens power?
Read the measurement of the diameter (DIA), given in millimeters; this is the distance from one edge of the contact lens to the other. Read the power (PWR) of the lens strength (it may be different for each eye), measured in diopters. The higher the power number, the stronger the prescription is.
How can I figure out my eye prescription?
Just remember that you can request your prescription details from the office where you last had an eye exam. They’re required to share a copy with you. If you’re looking for other options to find out your prescription based on existing glasses, there are other scanning apps like the one GlassesUSA offers.
What does axis mean for contacts?
The axis indicates the angle (in degrees) between the two meridians of an astigmatic eye. The axis is defined with a number from 1 to 180. The number 90 corresponds to the vertical meridian of the eye, and the number 180 corresponds to the horizontal meridian.
What is the difference between 8.4 and 8.6 base curve?
Studies show that a single base curve of 8.4mm managed a “good or better” fit in approximately 90% of individuals,1 and base curves of 8.4mm and 8.6mm together encompassed 98% of individuals….
| LENS | BASE CURVES AVAILABLE (mm) | DIAMETERS AVAILABLE (mm) |
|---|---|---|
| 3 | 8.6 | 14.2 |
| 4 | 8.4, 8.6 | 13.8 |
| 5 | 8.6 | 14.0 |
| 6 | 8.5, 9.0 | 14.2 |
What is BC contact lenses?
The ‘BC’ or base curve measurement indicates the back curvature of your contact lens, in millimetres. This is important for comfort, as the BC of your contact lenses should match your eye’s natural curve as closely as possible to ensure a better fit when you are wearing your contact lenses.
What do the negative numbers mean on contacts?
myopia
A negative number, such as -2.25, in this field indicates myopia, (nearsightedness), while a positive number like +2.25 indicates hyperopia (farsightedness).
How to rapidly determine a contact lens prescription?
Eye – Refers to which eye the prescription line item is for.
What to know about a contact lens prescription?
Base Curve. Base curve (BC) pertains to the back curvature of your contact lens and is measured in millimeters.
How do you write a contact lens prescription?
fill a prescription unless you have a copy of it or have verified it,as required by the Rule
Can you calculate my contact lens prescription?
The ‘Cylinder’ number for the contact lens prescription is not simply the other power you converted. It is going to be the difference between the converted power of the second principle power and the converted power of the first principle power. In this case it is… -5.00 – -4.00 = -1.00
