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.
Is there a big difference between 14.2 and 14.5 diameter contacts?
In fact, there is not much difference between these two. Some manufacturers only make 14.2mm diameter contacts, and some others produce 14.0mm diameter contacts. However, there is no manufacturer that makes both 14.0mm and 14.2mm diameter contacts. This is because they only choose one of these two small size contacts.
Can I wear contacts with a different diameter?
It is not recommended to wear contact lenses with a different diameter from your prescription. If the diameter is too wide, the lens will be loose in the eye and may slip out of place. If the diameter is too small, the lens will have a tight fit, causing discomfort.
What is the normal size for contacts?
The diameter of regular contact lenses that are sold in the United States are on average 14mm–16mm. Similar to the diameter of regular contact lenses, circle lenses have no more than 15mm diameter since larger sizes would be harmful to the eyes at daily wear.
Is 14.5 mm contact lenses?
14.5mm diameter contacts are one of our most popular sizes, creating a slight enlargement but will give you those big, cute eyes! We have a wide variety of 14.5 mm contact lenses, from cosplay circle lenses to natural looking lenses.
Is there a difference between 14.2 and 14.3 diameter contacts?
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.
What size circle lenses should I get?
CIRCLE LENS 101
14.0mm is sufficient enlargement for most people. Others won’t realise that you are wearing cosmetic enhancement lenses unless they get within 0.5 m of you and stare into your eyes. 14.5mm provides a dolly effect. Others will know that you are wearing cosmetic lenses.
How do you tell if your contacts are not the right size?
Place the contact lens between the tips of your thumb and forefinger, grasping it near the center so the entire edge is free. Gently squeeze the lens, as if you are about to fold it in half. If the edge of the lens points upward (resembling a hard-shell taco), the lens is correctly oriented.
What is the best base curve for contacts?
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.
What happens if you wear the wrong base curve?
If your lenses have the wrong diameter or base curve, you’ll likely feel that something is always in your eye. If the lenses are too flat, your eyelids will tend to dislodge them when you blink. The wrong size lenses can even cause an abrasion of your cornea.
Does the diameter of the eye change?
When you’re born, your eyes are about 16.5 millimeters in diameter. That’s a bit bigger than a pea. During your first 2 years of life, they get bigger.Your eyes will lose the ability to move and focus on near objects, but they won’t change shape.
How do I read my contact lens prescription?
Regular Prescription
- Eye – Which eyes the prescription line item is for.
- SPH – Sphere (this can also be referred to as Power or PWR)
- BC – Base Curve (usually a number between 8 and 10)
- DIA – Diameter (usually a number between 13 and 15)
- Brand – The brand/type of contact lens that your doctor has fitted you for.
What is the smallest diameter for contact lenses?
The smallest sclerals are approximately 14.5 mm in diameter, and the largest can be up to 24 mm. Lenses that are 18 mm or smaller are subcategorized as mini-sclerals.
What contacts have a 14.5 diameter?
Contact Lens Base Curves and Diameters
| CONTACT LENS | POWER (SPH) RANGE | DIAMETER |
|---|---|---|
| Biofinity Toric | +8.00 to -10.00 | 14.5 |
| Biofinity XR | +8.00 to -20.00 | 14.0 |
| Biomedics 1 Day Extra | +6.00 to -10.00 | 14.2 |
| Biomedics 1 Day Extra Toric | 0.00 to -10.00 | 14.5 |
What is BC and DIA for contacts?
Base Curve (BC): the number that indicates your contact lens’ shape. According to the steepness or flatness of your cornea, your prescription indicates how large your contact lens should be. 2. Diameter (DIA): a number indicating your contacts’ length to make sure they’ll cover your cornea properly.
What are toric contact lenses?
Toric contact lenses are designed to correct astigmatism, which arises when the cornea is curved so that the refraction of the eye is different between the vertical and horizontal planes. People with astigmatism experience blurry vision even when wearing a standard contact lens.
What does diameter mean for contacts?
Diameter: This stands for Diameter and is the length of the contact lens from one edge of the lens to the other. This is effectively the size of the contact lens and is used to make sure the contact lens covers the correct parts of your eye. E.g. DIA 13.8.
How do contact sizes work?
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 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.
Do circle lenses make your eyes look bigger?
Known as circle lenses, these are colored contacts — sometimes in weird shades like violet and pink — that make the eyes appear larger because they cover not just the iris, as normal lenses do, but also part of the whites.The lenses give wearers a childlike, doe-eyed appearance.
Can circle lenses damage your eyes?
They’re not being fit, and all eyes aren’t the same shape; some have steeper curves of the cornea, and some eyes are larger or smaller.” The issue is that improperly fitting contacts can cause short- or long-term eye damage, ranging from allergic reactions to corneal ulcers or corneal scarring.
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