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.
Benjamin Franklin, in the 1780s, invented something called bifocal lenses. Before that, those who needed such devices found it necessary to use 2 different pairs of glasses. The condition causing one to need a bifocal lens is called presbyopia. The first bifocal model was designed with a lens that featured a line across its width. The bottom portion was considered the reading lens, while the top section was used to see far away.
As individuals age into their 50s, presbyopia sometimes develops in such a way that it affects the intermediate vision, as well as distance and reading vision. With the help of a bifocal lens, the wearer can see far and near, but his or her arm's length vision remains blurry. In the 1940s, trifocals were invented, thus solving this problem.
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.
Benjamin Franklin, in the 1780s, invented something called bifocal lenses. Before that, those who needed such devices found it necessary to use 2 different pairs of glasses. The condition causing one to need a bifocal lens is called presbyopia. The first bifocal model was designed with a lens that featured a line across its width. The bottom portion was considered the reading lens, while the top section was used to see far away.
As individuals age into their 50s, presbyopia sometimes develops in such a way that it affects the intermediate vision, as well as distance and reading vision. With the help of a bifocal lens, the wearer can see far and near, but his or her arm's length vision remains blurry. In the 1940s, trifocals were invented, thus solving this problem.
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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