Have You Ever Wondered; How Do contact Lenses Work?

If you wear lenses, or even if you don't, chances are you have asked yourself, "how do feel lenses work?" After all, it's just a itsybitsy piece of plastic. It's amazing that without them, your foresight can seem awful. And with a itsybitsy thin lens, everything is clear. So let's take a closer look; how do feel lenses work?

[b]Lens[/b]

In their simplest form, feel lenses are nothing more than an optic lens; similar to that in a pair of eyeglasses, only much smaller and of a separate material.

For the nearsighted eye, the lens is a minus power. On eyeglasses, this makes for a thin town and thick edge. The same goes for feel lenses, a very thin town and a thicker edge. The incompatibility of the thin to thick makes up the power of the lens. For example, a -14.00 lens has thicker edges than a -2.00.

The inside curve of the lens, also called the base curve, is designed for optimum fitting on the cornea. Base curves are measured in mm of radius. For example, a base curve of 8.6 means that the lens has the same inside curves of a circle with a radius of 8.6mm.

Another major factor in answering how do feel lenses work?, the diameter. Diameter is measured edge to edge, also in millimeters. The diameter is altered for corporal fit and comfort. Any time the diameter is changed, the base curve needs to be revised. For example, a lens with a base curve of 8.6 and a diameter of 13.8 will be uncut flatter than a lens with a base curve of 8.6 and a diameter of 15.0.

To picture this in your mind, picture a circle and fantasize the top quarter of the circle is a lens. Now fantasize the top half of a similar circle is a lens. Can you begin to see how separate those two lenses would be?

Contact lenses only work properly when they have the permissible designate and they are fit correctly. A feel lens that is too steep will not only be uncomfortable, it will also originate a blurry image because of the distance in the middle of the front of your cornea and the back of the lens. A lens that is too flat will not town properly and the edges will buckle or lift off the white of the eye.

Once properly fit, the lens must stay hydrated in order to work properly. On soft feel lenses, this is concluded naturally by blinking. Think of your lids as windshield washers that permanently clean the lens. If you wear lenses, you may consideration that they blur a itsybitsy after long term computer use. This is directly associated to the fact that a persons blink rate slows when focusing on anyone up close, i.e. The computer screen.

As you can see the optic qualities, permissible fitting, and constant blinking are the main factors when figuring how feel lenses work.