Prism glasses work by redirecting light before it enters the eye so that it hits the retina at the correct focal point. The prism is shaped like a three-dimensional triangle with a base that’s thicker than the top. The prescription determines the orientation of the prism in the glasses lens (base up, base down, base in, or base out). The prism’s orientation affects how the lens directs light onto the retina.

a prism for glass's is a thin piece of clear film with vertical lines with spaces between the lines, these lines can be close or farther apart depending on the severity of the double vision

Our eye movements are controlled by twelve different muscles, and if only one of these
muscles is slightly weak, you can experience eye strain, headaches or even double
vision. In order for us to see a clear image, light coming into the eye must focus on an area at the back of the eye, called the retina. This is where the light messages are translated and sent on to the brain to produce the images we see.

For people who are long- or short-sighted, the light either focuses just in front of the retina, or behind it, which makes the images we see blurry. Glasses for these eye conditions are designed to bend the light coming into the eye so it focuses on the retina, producing a clear image.

If you have an eye muscle weakness, the remaining muscles work harder to prevent you seeing double vision, which can result in eye strain and headaches. In severe cases it can cause double vision. Prism lenses work by bending the light in such a way that it compensates for an eye muscle weakness, aligning your eyes and helping to maintain comfortable vision, as well as preventing double vision.

Small amounts of prisms are usually incorporated straight into your len

Hi Frankie😊💕