As they grow older, many people notice age-related vision problems that are normal. Even though it may be somewhat frightening to individuals, such vision changes are not usually a sign of a serious problem. However, it can be frustrating when one cannot see well enough to read or drive. Fortunately, trifocal lenses are available for individuals who need three different powers in one lens.
In the 1780s, Benjamin Franklin invented the first bifocals. Before this invention, those who were afflicted with presbyopia, which is essentially being both nearsighted and farsighted, had to own several pairs of glasses, one for each condition. The first bifocals featured a line traveling the width of the lens. The top section was for distance vision, and the bottom for reading.
When an individual reaches his or her fifties, the development of presbyopia sometimes causes the person's intermediate vision to become blurry as well. Bifocals may correct near and far vision, but the person's arm length vision is Still not good. Trifocals were invented to solve this problem in the 1940s.
Trifocals have an additional lens segment above the close-up vision section in the long-distance lens. This results in the glasses having 3 different strengths. They subsequently allow people to see with clarity in 3 different fields.
There are 2 types of modern trifocals. These are flat top and executive style. With executive style, ribbon shaped sections are divided by a visible line that goes throughout the width of the lens. Flat top designs have rounded segments and do not feature lines. The latter are very popular among many individuals.
Today's technological advancements have made it possible to design a broad range of multifocal contact lenses as well. The advantage of such devices is that they offer the same three clarified fields of vision as conventional eyeglasses. Ultimately, anyone experiencing vision problems that come with age should consider discussing trifocal lenses with a qualified optometrist.
In the 1780s, Benjamin Franklin invented the first bifocals. Before this invention, those who were afflicted with presbyopia, which is essentially being both nearsighted and farsighted, had to own several pairs of glasses, one for each condition. The first bifocals featured a line traveling the width of the lens. The top section was for distance vision, and the bottom for reading.
When an individual reaches his or her fifties, the development of presbyopia sometimes causes the person's intermediate vision to become blurry as well. Bifocals may correct near and far vision, but the person's arm length vision is Still not good. Trifocals were invented to solve this problem in the 1940s.
Trifocals have an additional lens segment above the close-up vision section in the long-distance lens. This results in the glasses having 3 different strengths. They subsequently allow people to see with clarity in 3 different fields.
There are 2 types of modern trifocals. These are flat top and executive style. With executive style, ribbon shaped sections are divided by a visible line that goes throughout the width of the lens. Flat top designs have rounded segments and do not feature lines. The latter are very popular among many individuals.
Today's technological advancements have made it possible to design a broad range of multifocal contact lenses as well. The advantage of such devices is that they offer the same three clarified fields of vision as conventional eyeglasses. Ultimately, anyone experiencing vision problems that come with age should consider discussing trifocal lenses with a qualified optometrist.
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