The degree of the discount eyeglasses online lens, especially for glasses with high astigmatism, is not the same for every angle. If the glasses are crooked, external light cannot pass through the optical center of the lens to reach the pupil, and the degree of the lens that passes through during normal viewing does not match the actual degree when fitting the glasses.

Long-term wearing of glasses that do not match one's degree may lead to a faster progression of myopia. Especially many parents choose functional children's glasses lenses such as full focus lenses, multifocal lenses, etc. to protect their children's vision. This type of functional lens also requires recording the wearer's single eye pupil height, and ensuring correct posture when wearing.

Crooked glasses can produce a certain prism effect, causing deformation of what is seen and emphasizing fatigue. There is also a portion of the population who may experience symptoms such as dizziness due to the inability to adapt to mismatched glasses prescription and long-term wearing.

How to determine if the glasses are crooked? A suitable pair of eyeglasses online should have horizontal rims on both sides, with an equal distance from the upper edge of the left and right rims to the eyelids, and the lenses should not touch the eyelashes. The nose pads and mirror legs on both sides are comfortable to fit the face, without clamping or loosening.

How to self-test? Firstly, remove the glasses and place them face up on a horizontal surface. Observe whether the opening and closing of the two legs of the glasses are symmetrical and whether the lower edges of the two lenses and the two ear hooks are stable; Turn the back of the glasses up again and check if the two legs of the glasses are aligned with the desktop; Then close the glasses and observe whether the left and right legs of the glasses can form a straight line.