- What data is required for the cheapest eyeglasses online?
(1) In the absence of astigmatism, the right eye degree, left eye degree, and pupil distance are sufficient.
(2) Astigmatism requires: right eye degree, right eye astigmatism degree, right eye axis, left eye degree, left eye astigmatism degree, left eye axis, and pupil distance.
- How to obtain optometry data?
If you don't have this data, you can go to a local eyeglass store or a professional ophthalmic hospital for optometry. After the optometry, you need the optometrist to handwrite a prescription that allows you to get glasses.
- What is pupil distance?
Pupil distance is the distance between two pupils. The purpose of measuring pupil distance is to ensure that the optical center distance of the discount prescription glasses lens is consistent with the pupil distance of both eyes, making it comfortable for users to wear. Otherwise, a prism effect may occur, and users may experience symptoms such as visual fatigue, dizziness, and nausea.
- What is astigmatism?
Astigmatism is an abnormal refractive condition of the eye, related to the curvature of the cornea. The human eye is not perfect. Some people have a curved cornea in certain angle areas, while others have a flatter cornea. The reason for astigmatism is due to the uneven thickness or curvature of the cornea, which causes the refractive index of each meridian of the cornea to be inconsistent, making it impossible for light passing through these meridians to concentrate at the same focal point. In this way, light cannot be accurately focused on the retina to form clear images, which is called astigmatism.
- What is axis position?
The axis represents the direction of astigmatism, and astigmatic contact lenses need to be accurately and stably placed on the axis to be corrected to ensure clear vision. Therefore, astigmatism must have an axis.
