Currently there are various types and brands of contact lens color (contact lenses) in the market. The purpose of wearing contact lenses were allowed to get out only to correct errors of reflection, which is an alternative to glasses, to a cosmetic device that can change not only face an even appearance.
Colored contact lenses contact lens special is different from the normal type used for the purpose of reactive. It can be divided into three categories based on the type of application are:
• colored contact lens 'prominent'
• color contact lenses 'cosmetic'
• colored contact lens 'therapeutic'
COLORED CONTACT LENS (PROMINENT)
Contact lens wearer will be more easy to handle contact lenses, particularly when the use, production or cleaning of the eye as if they are given a little coloring. The risk of damage or loss of contact lenses can also be reduced because it is easily seen to run. Dark contact lenses are also easier to be seen or detected when placed in the fingertips. Although the color has faded, contact lenses can easily be distinguished from a white background in normal contact lens storage container and thus easily removed from the container. In addition, it is easier to detect the contact lenses are not in the middle of the cornea or eye color if it is because it can be distinguished by the contrast between the colored contact lenses and konjuktiva background (white) eye.
Because contact lenses are easier to handle compared to contact lenses without color, the optometrist and eye care specialist that is very useful especially for those who first want to try contact lenses, children, elderly people, those impaired vision or near vision, and they are experienced in handling problems such as contact lenses previously often suffer loss or damage contact lenses.
COLOR CONTACT LENSES (COSMETIC)
Normal human eyes around the pupil of the eye (resume) and have certain colors is known as the iris. The majority of Asians have iris light brown or dark and sometimes difficult for observers to distinguish between the iris with a resume that is black.
But for the nations to the west and east of the center for example, iris color can be made up of several colors like green, blue and gray. The tendency to have different iris color from original colors for different looks is what led to the production of these cosmetic colored contact lenses. The use of cosmetic contact lenses have become part of the decorative accessories themselves, especially among teenagers and young people.
Cosmetic colored contact lens is able to highlight the beauty of the eyes through the mechanism of iris color change or enlightenment. This situation can occur because of contact lens is able to absorb the colors have different wavelengths. Effect of color on these contact lenses can not be seen until after the eye of a subject. The combination between iris color and type of lighting could affect the appearance of the eye. Dark brown iris color can be changed by such cosmetic contact lenses are not dark and dull colored lenses to cover the entire iris. Iris gray will look more beautiful with cosmetic contact lenses, blue or green. Iris light brown suit also said the green cosmetic contact lenses.
COLORED CONTACT LENS (THERAPEUTIC)
Colored contact lenses can also be used for prosthetic purposes to improve visual function in addition to improving appearance, especially for those who suffered eye damage. This type of lens can be produced by holding the space for the eyes still resume work or resume it provided no space for the eyes that no longer work.
Fotofobia is the discomfort experienced by the eyes when exposed to light, such as sunlight. This condition is suffered by the patient marcosilva less pigment in the iris and a patient who does not have afakia crystalline lens in their eyes. They are often reported glare when exposed to sunlight. Colored contact lenses can help reduce this glare problem.
In addition, colored contact lenses are used to enhance color vision such as X-chrome lens. This lens is reported to be able to improve color discrimination in patients with red-green defects.
COLOR FADE PROBLEM ON COLORED CONTACT LENS
Color fading in color contact lens can occur when contact lens wear in a certain period and when it is exposed to environmental elements such as cosmetic tool, dust from the water points and the type of contact lens care system is. Different color will react differently depending on the material bonding perwarna basis of the contact lens.
Chlorine in swimming pools, water supply, distilled water (distilled) in high concentrations is able to fade the color in whole or in part is exposed. The use of chemicals such as peroxide benzoil in the acne drug may also affect the color change of this contact lens. Colored contact lenses have become popular as an alternative to glasses and used to run simple, cosmetic or therapeutic.
Technology is expected to continue growing to produce a colored contact lens that can meet the tastes of the wearer in terms of comfort and durability and is able to take place without the color contact lenses as a whole.