How to calculate the degree of cylindrical mirror

summary

With the improvement of living standards, computers and mobile phones have become popular. However, our eyesight has a lot of problems, so some people have to wear glasses. Cylindrical glasses are often seen. How to calculate the power is the following.

How to calculate the degree of cylindrical mirror

First, the cylindrical mirror refers to the cylindrical mirror, which is generally called astigmatism, which is divided into myopic astigmatism and hyperopic astigmatism. The optical axis and the axial direction of the cylindrical mirror generally refer to the placement angle of the cylindrical mirror, with the horizontal position as the reference.

Second, for example, the visual acuity of a patient is - 1.0 for right spherical lens, - 0.5 for cylindrical lens, 90 for axial direction, 0.5 for left spherical lens, 0.5 for cylindrical lens, 80 for axial direction. Then spherical mirror + 1.0 means normal. Lower than + 1.0 means myopia, higher than + 1.0 means hyperopia, right spherical lens - 1.0 means myopia is 1.00d, rear cylindrical lens - 0.5, axial direction means astigmatism degree is 0.5d, and axial direction is 90, which means that the optometrist will turn the astigmatism lens to the axis of 90d.

Third, when you have vision problems, you need to wear a prism. You can go to a special eye shop, and the optometrist will calculate the power of the prism for you.

matters needing attention

Wearing glasses brings a lot of inconvenience to my life, so we should take good care of our eyes at ordinary times. Don't use our eyes for a long time, and have a proper rest.