The 8.4mm base curve is still the likely best fit for the majority of eyes. In instances when the 8.4mm lens is too steep, the 8.8mm lens allows a flatter option. This is more likely needed in smaller eyes, and possibly in some very flat corneas. … Oasys lenses are approved for up to six nights of continuous wear.

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.

What base curve do I need?

The most basic rule is that you always want the base curve to be as close to +6.00 as you can get and still have the Rx work. The more minus the power (less plus power to minus power) the lower plus the base curve will become. A high minus Rx may even have a base curve of +0.25 or even 0.00.

How important is base curve in contacts?

It determines the type of fit the lens must have to match the natural curvature of your eye. A person with a higher base curve number has a flatter cornea (the clear, front surface of the eye) compared to someone with a lower base curve number, which indicates a steeper cornea.

Can I wear a contact lens with a base curve of 8.6 instead of 8.4?

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.

Can I wear a different base curve?

Can I order contact lenses with a different base curve? You should never order contact lenses with a base curve that is different from your prescription. This can damage your eyes and cause problems with vision.

How do I know what base curve my glasses are?

Figuring out the proper base curve based upon Rx is fairly simple: Plus Power – Use the Spherical Equivalent (Sphere power plus half the cylinder power) and add 4.00 diopter to that. Example – Rx of +2.50, the base curve will be approximately 6.50.

How do I know the base curve of my eye?

Corneal Curvature

Generally, your eye doctor will use a keratometer to measure the curve of your cornea, which is the front surface of the eyes – where contacts rest. These numbers help to determine the lens diameter and base curve that appear on your contact lenses prescription.

Does your eye base curve change?

Base curve can also change as you wear a contact lens based on environmental factors like the lens drying out, temperature changes, and exposure to makeup or soaps. As a doctor, selecting a contact lens for best fit is also challenging because the sagittal depth of any contact lens is not notated on the packaging.

Is there a big difference between 8.5 and 8.8 base curve?

The 8.8 BC is “flatter” than the 8.6 lens, meaning that the 8.6 lens has slightly more curvature or “steeper”. The 8.6 base curve will be a better fit for most people. In general, 8.8 BCs are more likely to fit loose and move excessively on the eye.

Is there a big difference between 8.5 and 9.0 base curve?

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. Also, the material of the lens can also affect the fit. You can have 3 diff contact lenses with the same BC, Diameter and power and they will all fit differently.

How do I choose a base curve for soft contact lenses?

Base Curve Many lens fabricators suggest starting with a base curve radius (BCR) that is 4.00D to 5.00D flatter than flat K. Another method is to trial-and-error fit by selecting the middle BCR available. Most soft lens designs feature three BCRs: Steep, median and flat.

Is there a big difference between 8.6 and 8.7 base curve in contact lenses?

“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.

Can you change base curve on contacts?

Correcting a flat or steep fitting custom soft contact lens requires changing the sagittal depth of the lens by altering the base curve or diameter. To correct for a flat fitting custom soft toric, sphere, or multifocal contact lens the practitioner must make a change that will increase the sagittal depth of the lens.

What happens if I wear the wrong prescription contacts?

Myth 4: Wearing the wrong prescription can damage your eyes. “Who hasn’t tried on someone else’s glasses and felt dizzy and disoriented? The wrong prescription may feel weird and it can even give you a headache if you wear them very long, but it won’t damage your eyes.

Can you feel your contact lenses?

You might be able to feel your contact lens sitting on your eye. It’s weird but normal! Blink as normally as possible, and apply eye drops if your contacts feel dry or out of placement. You’ll get used to the feeling as you wear your contacts more often.

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