Diplopia (double vision) is a rare but disturbing condition. It happens when the images of objects before you are formed in different parts of the retinas in your two eyes. Many disorders of the eye ...

Prism glasses bend and redirect light before it meets the eye. They may help improve double vision for people with an eye misalignment or condition. If an eye doctor suspects someone may benefit from ...

A periscope camera lens is a lens assembly that uses prisms, mirrors, or a combination of them to redirect light before it reaches the camera sensor. In doing so, it magnifies the image more so than ...

Pentax have announced the addition of the new PCF WP models to the acclaimed Pentax PCF series of porro-prism binoculars. This new series features six high-performance, waterproof models: 8x40 PCF WP ...