Eyeglasses have come a long way now since it was originated in 1268 in Pisa, Italy. Although the exact inventor was unknown, the first users of eyeglasses were scholars and monks. As the printing press grows, the rising rate of literacy encouraged mass production for eye glasses. Hundred years ago, eye glasses were made by hand, but by the time of the 1900s and as technology advances, so does eyeglasses. Eye glasses used to be thick and heavy. But in our generation, today, thinner, lighter and scratch resistant lenses are commonly used to place in our glasses.
There are several reasons why people wear eye glasses, although some people do for fashion statement, most people do because of the following eye problems:
• Myopia – is when a person can clearly see things that are close, but needs eyeglasses to see clearly things that are far away. This is also called as near-sightedness.
• Astigmatism – is the result when a person’s cornea is shaped like oval rather than round. Having astigmatism causes blurry vision but it can be amended with eyeglasses.
• Anisometropia – is when a person has two eyes that are different, it usually causes unbalanced vision. Eyeglasses tend to help each eye individually, and both lenses are different.
• Hyperopia – is usually common and does not require eyeglasses. Still, if the hyperopia is serious, a person’s eyes will have to work focus harder on close objects. Hyperopia is also called as the far-sightedness.
• Accommodative Esotropia – is when a person has excessive hyperopia which results in a person’s eyes to cross at times. Wearing glasses are can usually aid the “crossing of the eyes.”
Now that we’ve established the common reasons why people wear eye glasses let’s get to the types of lenses to get for your eyewear. Each one is different, and each one will properly cater to your need.
• Polycarbonate lenses – just like tribes, polycarbonate lenses are made from plastic materials that are usually impact-resistant. It is regularly used by people who play in sports. These lenses contain ultra violet protection that significantly protects the eyes from the sun.
• Multifocal Lenses – people who have more than one problem in eye vision needs multi focal lenses to aid their eyes. It can also be termed as “bifocals” and “trifocals”.
• High index plastic lenses – is meant for people who needs strong eye prescriptions. It is better, lighter and thinner than regular thick lenses for people who have poor eyesight.
• Polarized lenses – is used to reduce reflected glares from sun or water. It is usually used for driving and sports.
• Photochromic lenses – this lens is usually made from plastic or glass. Photochromic lenses change from tinted to clear whenever it is exposed to sunlight.
• Aspheric lenses – this lens is typically spherical in shape. It is made to differ in the surface which results to flatter and thinner lenses.
Since lenses are already enumerated, there are also several coatings necessary for different lenses. The decision can be according to what you want in an eyeglass-like:
• Scratch-resistant with ultraviolet lenses
• Tinted lenses
• Anti-reflective coating
• Mirror coatings