The principle of childrens glasses for astigmatism and different age groups:

• Under 3 years old, individuals with astigmatism not exceeding 200 degrees may temporarily not wear glasses; When the degree of astigmatism exceeds 200 degrees, partial correction should be made to improve amblyopia.

• 4 to 10 years old, with an astigmatism degree of ≤ 100 degrees and a normal visual acuity, glasses may not be worn temporarily; If the vision is below normal and requires glasses, astigmatism should be corrected as much as possible; If the astigmatism degree is greater than 100 degrees and the vision is low, children's glasses should be worn to prevent amblyopia.

The principle of astigmatism glasses is that for medium to low degree astigmatism, the children's glasses should be inclined towards foot correction; High degree astigmatism, which may not be suitable for one full correction, can be corrected in stages. First, wear low-degree astigmatism, and then change the full correction degree after adaptation. The initial mirror degree should not be less than 2/3 of the column degree (astigmatism degree).

• For those aged 10-40, with astigmatism ≤ 100 degrees and no blurring or fatigue symptoms, glasses are not required; If there are symptoms of low vision and glasses need to be worn, astigmatism should be corrected as much as possible;

If the degree of astigmatism is greater than 100 degrees and affects vision, foot correction should be performed, especially for patients with symptoms of visual fatigue; If the astigmatism is high, it can be corrected in stages.

(4) Over 40 years old, in this age group, astigmatism may frequently change with changes in the lens and cornea. Patients should fully consider their adaptation, make appropriate corrections, and undergo regular follow-up examinations.