Glasses & Contact Lenses :
Glasses & Contact Lenses
Leonardo da Vinci was, the first to suggest the use of contact lenses to correct defective vision in 1508. In Germany, nearly four centuries later, the first contact lens manufactured was a glass shell that covered the entire surface of the eye. Modern contact lenses appeared in the 1940s.
Today, many people prefer them to eyeglasses for reasons of convenience or cosmetics, although spectacles offer far more protection for the eye. Present-day contact lenses cover only the cornea of the eye; So-called soft lenses, now in common use, are made from a soft plastic material that molds itself to the shape of the cornea. With advancing technology Contact Lenses can correct all forms of visual defects including Astigmatism safely and comfortably. There are basically two types of contact lenses : Rigid and Soft. Both types come in varying materials with different levels of oxygen permeability. The higher the oxygen permeability the better it is for the eye. Contact Lens care is the most important part of contact lens wear. Good eye care also includes proper care of the lenses. A new system of prescribing and manufacturing contact lenses has been introduced known as the Disposable contact lens, which enables the replacement of lenses on Daily, Weekly, Monthly, and Three Monthly basis. The advantages of this system of prescribing is that, frequent infections due to protein deposits and environmental pollution are almost eliminated, the eye gets more Oxygen, Vision and Comfort are greatly increased, and best of all, simple cleaning systems like multipurpose solutions can be used safely. 
Glasses Vs Contact Lenses :
All types of contact lenses should always be kept clean, disinfected and hydrated. Lens hygiene is the key to a comfortable wear. All contact lenses accumulate a variety of deposits, from the eye itself whilst wearing them, and from the environment. The environment also contributes towards building up of these deposits especially on soft lenses.
The chemical pollution from cars, factories etc., dust, metal in the air get embedded onto the surface, causing harmful contamination on the lens surface, over a period of time. In order to prevent these deposits, all contact lenses should be cleaned, soaked and disinfected daily or disposable should be used. |
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