Fitting glasses is all about personalization. Eye glasses testing for students. The lens parameters determine the visual effect. Material and refractive index are important. Degree and interval selected.
Physical examination and optometry. Students first have to perform a visual acuity and eye error check to obtain prescription and optometric data, which is the basis for lens selection.
Determine the material. According to living habits and economic ability to choose the lens material, the general students choose plastic or glass material more, the former light and wear-resistant, the latter lower cost.
Select the refractive index. The refractive index determines the thickness and weight of the lens, and lenses with a high refractive index are thinner and lighter. Choose the appropriate refractive index according to the degree, usually 1.5 or 1.67 students.
Determine the degree interval. The degree interval directly affects the thickness of the lens, and the smaller the interval, the thinner. However, students with high degrees and large differences in degrees are more comfortable with a wider gap. Generally 0.5D~0.75D is suitable.
Select lens processing. Choose from different finishes such as flat aspherics, progressive multifocal or asymptotic optical designs for a more comfortable and clear visual effect.
Select the frame. The frame should match the selected lens, taking into account factors such as degree, lens shape and size. Choose a comfortable, stable frame that won't slip off.
Select the material; Determine the refractive index; Determine the degree interval; Select lens processing; Match the frames.