The contact lens technology is the most popular replacement for eyeglasses. If you have an impaired vision, then going with modern contact lenses have become one of the most popular choices.

When do you have a vision problem? When your cornea – the natural lens inside your eye that has existed since you were born – changes its curvature or experiences a change in its refractive capability, the external light rays do not fall onto the right vision spot (“yellow spot” and its surroundings) inside your eyes. As a result, your vision becomes blurred. The job of your contact lens is to provide the additional refraction so that the focus of the external light entering your eyes is centered on your yellow spot, and you gain back your accuracy of vision. To understand what sort of contact lenses would work the best for you, you need to understand the above-mentioned process in more detail.

Historically speaking, the scientists of the past had observed the refractive properties of glass as well as of water, and had wondered whether such properties could leverage weakened human vision. A series of experiments led to the discovery of eyeglasses. This concept further evolved to place the glass right on the surface of the eye, and eventually this led to the birth of contact lenses. So fundamentally, both eyeglasses and contact lenses work based on the same principle – by providing compensation for the changes in the refractive index of your eyes.

The changes in your eyes can happen in two different ways. Either the shape and/or the refractive index of your eye changes such that the light entering your eyes focuses before the yellow spot, or the light focuses beyond the yellow spot. This leads to nearsightedness or farsightedness. For accurate vision, this light must focus exactly on your yellow spot.

The corrected refractive index provided by the contact lens will let you do exactly that. Once the lens fits your eyes, the light first has to travel through the lens and only then can it reach your eyes. The lens would change the direction of the light such that with your current refractive index of your eyes the focus happens exactly on the yellow spot of your eyes.

Now you understand the reason why your ophthalmologist would examine your eye to figure out exactly how much your eye has deviated from its expected vision levels. Based upon the desired refractive index found and also based upon your habits, lifestyle, and possibly profession, s/he will prescribe the appropriate type of contact lenses for you.

Contact lenses are evolving as technology evolves. So, knowing how the contact lenses fundamentally work and being aware of the different kinds of lenses available, you can make the right choice of your lenses.

The contact lens technology is the most popular replacement for eyeglasses. If you have an impaired vision, then going with modern contact lenses have become one of the most popular choices.

When do you have a vision problem? When your cornea – the natural lens inside your eye that has existed since you were born – changes its curvature or experiences a change in its refractive capability, the external light rays do not fall onto the right vision spot (“yellow spot” and its surroundings) inside your eyes. As a result, your vision becomes blurred. The job of your contact lens is to provide the additional refraction so that the focus of the external light entering your eyes is centered on your yellow spot, and you gain back your accuracy of vision. To understand what sort of contact lenses would work the best for you, you need to understand the above-mentioned process in more detail.

Historically speaking, the scientists of the past had observed the refractive properties of glass as well as of water, and had wondered whether such properties could leverage weakened human vision. A series of experiments led to the discovery of eyeglasses. This concept further evolved to place the glass right on the surface of the eye, and eventually this led to the birth of contact lenses. So fundamentally, both eyeglasses and contact lenses work based on the same principle – by providing compensation for the changes in the refractive index of your eyes.

The changes in your eyes can happen in two different ways. Either the shape and/or the refractive index of your eye changes such that the light entering your eyes focuses before the yellow spot, or the light focuses beyond the yellow spot. This leads to nearsightedness or farsightedness. For accurate vision, this light must focus exactly on your yellow spot.

The corrected refractive index provided by the contact lens will let you do exactly that. Once the lens fits your eyes, the light first has to travel through the lens and only then can it reach your eyes. The lens would change the direction of the light such that with your current refractive index of your eyes the focus happens exactly on the yellow spot of your eyes.

Now you understand the reason why your ophthalmologist would examine your eye to figure out exactly how much your eye has deviated from its expected vision levels. Based upon the desired refractive index found and also based upon your habits, lifestyle, and possibly profession, s/he will prescribe the appropriate type of contact lenses for you.

Contact lenses are evolving as technology evolves. So, knowing how the contact lenses fundamentally work and being aware of the different kinds of lenses available, you can make the right choice of your lenses.