OD, or ocular dexter, is Latin for the right eye. If you see an OU on your label, meaning ocular uterque, it means the prescription is the same measurement in both eyes. BC. This stands for base curve. It's the back curvature of your contact lens, which is measured in millimeters.

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Similarly, you may ask, is there a big difference between 8.4 and 8.6 base curve?

Acuvue Oasys contacts come in 8.4 and 8.8 BCs, while other contacts may come in 8.3 and 8.7, or only one curve such as 8.6, in the hopes that its medium curve will fit the majority. There is a difference in fit of the 8.4 and 8.8 lenses. That . 4 difference in base curves is quite significant.

what does PWR mean in eye prescription? Here's what those abbreviations mean: 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)

Just so, what is the normal BC for contact lenses?

BC values range from about 8.0 to 10.0. The doctor fits the lens with the curvature most appropriate for your eye. Most lenses come in several different BC values. If your prescription does not contain a BC value, this is likely because your brand of lens only comes in one base curve.

How important is base curve in contacts?

Base Curve (BC) is a measure of the curvature of the contact lens. This helps it fit your cornea more comfortably since some corneas are "steeper" or "flatter" than others. The higher the Base Curve number the "flatter" the curvature of the cornea. How do you determine the diameter for contact lenses?

Related Question Answers

Is there a difference between 8.4 and 8.5 BC?

No there is not a big diff between the two base curves. However, it's the relationship between diameter and base curve that is more important.

Does base curve affect vision?

The base curve of a lens may affect certain aspects of vision, such as distortion and magnification, and wearers may notice perceptual differences between lenses with different base curves. Consequently, some practitioners may specify "match base curves" on a new prescription.

What is the most common base curve for contacts?

There is no standard base curve for contact lenses because all eyes aren't all the same. The most common base curve would be BC 8.7mm. If you are not sure about your base curve, please don't guess. You'll need to consult with your eye care professional about this.

Does diameter matter in contact lenses?

Yeah, the diameter of the contact lenses does matter. you need to get the prescription for the contact lenses form your eye doctor firstly, then to get a pair of contacts. It is not allowed to get the contacts when you do not have your prescription. Different people have different size at the eyes.

How do you know what your base curve is for contacts?

The base curve is the measurement of the inside curve of your contact lenses. As part of your contact lens exam, your optometrist will do a Keratometer reading. The base curve number would be a number between 8.0 and 10.0 millimeters and would be more precise because these lenses need to fit just right.

Can your base curve change?

Only a computer can determine the correct base curve on a lens designed using free-form technology. In fact most labs today will not allow you to change or request a base curve at all. 3) Never attempt to change the lens base curve to match a frame base curve.

How important is base curve?

Optician's answer. A base curve measurement represents how curved your contact lens is. This measurement affects how a contact lens sits on the front surface of your eye, and is quite important. Changing this value, even by a small amount, can cause blurred vision and discomfort if it's not suitable for you.

What does axis mean on eye prescription?

Answer: The axis number on your prescription tells your optician in which direction they must position any cylindrical power in your lenses (required for people with astigmatism). This number shows the orientation or angle in degrees from 1 to 180. The number 90 means vertical position and 180 horizontal.

What happens if you wear the wrong size contacts?

A wrong sized contact lens will not only cause discomfort but it can cause some serious problems to the surface of your eye. If the size is different, the contacts can either be too steep or too flat. This compromises the fit of your contact lenses.

What is the average diameter for contacts?

Most patients will fall in the range of 8.5 to 8.7 base curve (median) and 14mm would be averages. Typically its better for soft lenses to fit flatter than steeper. Soft lenses cover the entire cornea and actually extends past the limbal area by a few mm.

What is the difference between 8.6 and 8.7 base curve?

“Is there a big difference between 8.6 and 8.7 base curve in contact lenses?” No, the difference is small. The 8.7 curve is . 1mm flatter, but since these are soft lens curvatures, and soft lenses assume some of the shape of the cornea, the fitting value won't be changed dramatically.

Does your eye BC change?

yes, they do! if the base curve (BC) is small, it means it is smaller in radius and thus causing it to wrap around your cornea more. that also means that if your cornea has a flatter curvature, it will be too tight around it, therefore reducing the amount of oxygen supply into the eye.

How do you measure your eyes for contacts?

In a simple approach, a card or ruler showing different pupil sizes is held next to your eye to determine the best match. Your eye doctor may hold a pupil gauge next to your eye to determine the approximate size of your eye's pupil as part of your contact lens eye examination.

What does D mean for contacts?

Dioptre Sphere

What is the strongest contact lens prescription?

The highest level of corrective power for monthly soft contact lenses is about -12 Dioptres (bear in mind that the average prescription for short sighted people is -2.00 Dioptres), and is available from both Purevision 2HD and Biofinity.

What does BC on contacts mean?

base curve measurement

Can I wear contacts with a different base curve?

The doctor fits the lens with the curvature most appropriate for your eye. Most disposable contact lenses come in several different base curve values. base curve values are a bit like clothes sizes - just because you are a base curve 8.6 in one brand of contact lenses doesn´t mean you will be in another.

Is there a difference between left and right contacts?

Most of the time there is no difference between the left and the right circle lens but it can happen when you have to wear contact lenses prescribed by your practitioner. Your ophthalmologist can prescribe different corrective contact lenses for each of your eyes, depending on the needed correction.

Is power the same as sphere?

Sphere power, cylinder power and add power always appear in diopters. They are in decimal form and generally are written in quarter-diopter (0.25 D) increments. Axis values are whole numbers from 1 to 180 and signify only a meridional location, not a power.