How do I know what base curve my glasses are?

How do I know what base curve my glasses are?

The base curve of any lens can be measured with a tool called a radius gauge, also known as a lens clock. A lens clock has three prongs that can measure the curvature of lenses (and other surfaces). When those 3 prongs are place against a flat surface, the gauge should read zero.

What is base curve in eye glasses?

What is a base curve? Base curve is a description of the front surface curvature of a lens measured in diopters. Example: an 8 base lens shape will have the equivalent front surface curvature to an 8 power lens made out of crown glass. The higher the curvature gives the glasses more of a curvature.

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.

What is base curve prescription?

The base curve refers to the degree of curvature of the contact lens, or how closely it fits against the eyeball. A lower BC, like 8.40, means the lens is more curved and will fit snugly against the eye. Higher BCs like 8.70 indicate a flatter lens.

Does base curve matter in glasses?

If you have a high prescription, the flatter base curve will accommodate the stronger correction. However, the lower the base curve, the more light will be let in through the sides of your sunglasses.

How does base curve affect glasses?

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.

What is a contact lens base curve?

The base curve is the primary fitting curve on the back surface of the contact lens. This curve should be nearly the same as the curvature of the front surface of your eye (cornea). By conforming well to the center of your cornea, the lens surface will be smooth and uniform for clear, undistorted vision.

What is the base curve of a contact lens?

The base curve, or BC, is the radius of the back of the contact lens, the part that sits on your eye. According to Laser Eye Surgery Review, the average measurement of a base curve is between 8.0 and 10.0.

What is the base curve for contact lenses?

Typical values for a contact lens are from 8.0 to 10.0 mm. The base curve is the radius of the sphere of the back of the lens that the prescription describes (the lower the number, the steeper the curve of the cornea and the lens, the higher the number, the flatter the curve of the cornea and the lens).

What is the base curve of contact lens (BC)?

Base curve radius, or simply base curve, abbreviated BCR or BC, is the measure of an important parameter of a lens in optometry. On a spectacle lens, it is the flatter curvature of the front surface. On a contact lens it is the curvature of the back surface and is sometimes referred to as the back central optic radius (abbreviated BCOR).