CONTACT LENSES - Ophthalmic Equipment - Mercoframes Optical Corp Contact lens, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, and they can be worn to correct vision or for cosmetic or therapeutic reasons.

CONTACT LENSES

Contact lens, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, and they can be worn to correct vision or for cosmetic or therapeutic reasons.

Corneal and rigid lenses (1949–1960s)

In 1949, the first "corneal" lenses were developed. These were much smaller than the original scleral lenses, as they sat only on the cornea rather than across all of the visible ocular surface, and could be worn up to 16 hours a day. PMMA corneal lenses became the first contact lenses to have mass appeal through the 1960s, as lens designs became more sophisticated with improving manufacturing technology. On October 18, 1964, in a television studio in Washington, D.C., Lyndon Baines Johnson became the first President in the history of the United States to appear in public wearing contact lenses, under the supervision of Dr. Alan Isen, who developed the first commercially viable soft-contact lenses in the United States.

Contact lenses are a great option for almost everyone who needs vision correction and doesn't want to wear glasses all the time or have surgery.

Contact lens materials

The first option when considering contact lens wear is which material will best suit your needs. There are five types of contact lenses, depending on the type of material with which they are made:

Contact lens wear time

Until 1979 everyone who wore contact lenses took them off and cleaned them every night. The introduction of "extended wear" allowed wearers to sleep with their glasses on. Now, two types of lenses are classified by time of use:

 

Contact lens designs

Soft contact lenses (both normal hydrogel and silicone hydrogel) come in a variety of designs, depending on the intended purpose:

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