Yes they do matter. The BC, or base curve, is measured based on your cornea’s curvature. If the base curve is too small, it’ll squeeze your eye, and if it is too big, it won’t stay on your cornea. These both may cause damage to your eye.
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.
Also, is there a difference between 8.5 and 8.6 base curve? The difference between an 8.5 and an 8.6 isn’t the curvature , but the fact that it is a different lens. Contacts are the same as shoes in a sense. Matching the curvature or diameter of a different brand does NOT mean it will fit the same, or even fit close sometimes.
Just so, what is the average base curve 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.
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.
Does base curve affect vision?
If the base curve is flatter than prescribed (ex: 8.8 instead of 8.4), it may not affect vision, but it will affect fit. The lens will most likely move too much, and the edges may tend to curl outward. There is more base curve flexibility with soft lenses as they conform more or less to the cornea.
Can contacts be too big?
If the base curve of the contact lenses is too big, the contacts won’t sit perfectly om the eyes. It will moves around in your eyes and also make you uncomfortable. This is the reason why you need to take an eye examination for prescription before you buy contact lenses.
Does contact lens diameter make a difference?
Yes, it is quite important. When you are wearing contact lenses with bigger diameter than you need, the contact lenses are so loose that they move around everywhere and out of its own place. This causes discomfort and visual acuity. What’s worse, it may cause corneal damage by tearing or scrape your cornea.
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.
How do I choose a contact lens base curve?
Lens thickness, water content and material all affect base curve determination. Still another method is to use the following as a guide for selecting base curves: If Low K is >45.00D, then fit the steeper BCR. If Low K ranges from 41.00D to 45.00D, then fit the median BCR. If Low K is <41.00D, then fit the flatter BCR.
How important is diameter in contact lenses?
Among them is the best diameter for that new lens to keep it as stable as possible. The base curve, the depth of the lens, the material of the lens , the water content of the lenses , all come into play to determine the diameter that will work in balance with the rest of the parameters.
Is Acuvue Oasys for Astigmatism a monthly lens?
ACUVUE OASYS® Contacts Lenses for ASTIGMATISM 2-Week use BLINK STABILIZED® Design helps minimize shifting and helps keep vision crisp, clear and stable all day long—even for people with an active lifestyle.
What does BC mean on contacts?
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. On the other extreme, it can hug your eye too tightly and badly affects the layer of tears to fully cover your eyes.
How do you know your eye size for contacts?
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. Automated instruments that measure pupil size also exist.
Does base curve and diameter matter?
Yes they do matter. The BC, or base curve, is measured based on your cornea’s curvature. The diameter is measured based on the size of your cornea, and it is also important for it to fit your eye in order for it to be comfortable and not cause any damage.
What is the average eye diameter?
What does 8.6 mean on contact lenses?
8.6 is the base curve of the contact and relates to the way a lens fits/rides on the eyeball. But this question means you are contemplating taking foolish risks with the health of your eyes. There is a lot more to how a lens fits than mere base-curve.
How important is the base curve and diameter on contact lenses?
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?