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Single Vision

When were single vision lenses invented?

Thought to have been created as early as the 5th Century BC, single vision lenses were used primarily to magnify images close up. The first mention of lenses used to correct distance vision problems was in 60 AD. This lens was used to view gladiator competitions by a Roman Emperor. Over a thousand years later, the first lens was invented to correct astigmatism by an optician in Philadelphia. Astigmatism is a very common eye condition that requires single vision corrective lenses. Up until the early 1800’s, one suffering from astigmatism had no hope of clear vision.

What are single vision lenses?

Single vision lenses are lenses with only one dioptric power. They are primarily used for single power distance or reading spectacles—the two most common reasons people wear glasses.

What are single vision lenses used for?

Single vision distance lenses are designed to help those have trouble seeing things far away. If the prescription begins with a ( - ) or nearsightedness, this lens is suitable. With nearsightedness, objects in the distance appear blurry because the nearsighted eye focuses images in front of the retina rather than on it. An optimally fitted pair of distance lenses can help you see clearly when looking at objects which are far away. Reading lenses help you see things at a close distance. They're best suited for helping to see things at distances of 30 to 40 cm. These lenses are great not only for books, but also for reading smaller font sizes on a smartphone or tablet. Farsighted wearers usually have blurry vision in the near zone and sometimes when looking into the distance.