There are many different types of eye glasses, and they are commonly classified according to function. Eyeglasses have gone a long way from being first invented way back in the 9th century. Throughout the years, eye glasses have evolved from being used solely as magnifiers to being fashion accessories used by celebrities and prominent personalities.
Today, different kinds of eye glasses serve various functions such as shielding the eyes from the sun's glare, repairing vision impairment, and even enhancing movie-goers' cinematic experience. For purposes of brevity, this article will focus on two of the more popular classifications of eye glasses: reading glasses and corrective eye glasses.
Reading and/or Magnifying Eye Glasses
Glasses with magnifying lenses used to be considered as the standard, with people buying and using them to treat hyperopia (farsightedness) and mild presbyopia (reduced ability to focus on nearby objects). However, as more and more people found that the eye glasses being sold off store shelves didn't quite meet their needs, they started consulting qualified optometrists to get individual prescriptions for eye glasses.
Presbyopia is a condition characterized by the eye's reduced ability to focus on objects. This is a common condition associated with aging, and is easily treated or managed by using bifocals or trifocals – depending on the severity of presbyopia. Also called multifocal lenses, these traditional eyeglasses are designed with two or three viewing areas, each differentiated by its amount of magnification and focus. Earlier designs of bifocal and trifocal lenses showed the glasses having visible horizontal lines to delineate the areas. However, progressive lenses, also called “no-line” bifocals or trifocals, were developed later on, making these types of eyeglasses more aesthetically pleasing and giving wearers a better visual transition.
Bioptics, on the other hand, are eye glasses that have extreme magnification and are used by those with severe vision impairment. This type of eye glasses dramatically improve the wearer's distance vision and can take the form of stand-alone glasses that look like binoculars or goggles, or are attachable to traditional eyeglass frames.
Corrective Eye Glasses
As the name implies, this type of eye glasses are used to correct the eye's refractive errors by adjusting the focal length of the lens. Corrective eye glasses are commonly used to treat or manage eye conditions such as astigmatism, nearsightedness, or farsightedness. One type of corrective eye glasses is pinhole glasses, which are used to correct refractive error without the image distortion experienced when wearing lens-based, traditional eye glasses.
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