The difference in the optical center refers to the deviation of the pupil center from the optical center of the discount eyeglasses online lens. There are regulations for the horizontal deviation of the optical center, the horizontal deviation of the optical center, and the vertical deviation of the optical center.

In theory, when the optical center of the cheapest eyeglasses online lens is on the axis of the eye, the correction effect and comfort are optimal. When the eye is looking straight ahead, the prism effect is zero; When the optical center of the lens deviates from the visual axis of the eye, a prism effect occurs. The higher the top power, the farther it deviates from the optical center, and the greater the prism effect.

Due to the long-term lack of good visual quality and significant changes in refractive index, the visual perception is distorted and unable to adapt to the new lens. We should lower the prescription degree to achieve the physiological vision he needs and communicate with him. After using it for a few months to adapt, we should change the degree to foot correction.

The main purpose of optometry is to provide patients with a prescription for discountglasses, which provides wearers with good corrected vision, comfortable vision, and the ability to read for a long time without causing any damage to the eyes.

In actual optometry glasses, the deviation of pupil distance is relatively rare to encounter, because this parameter can be accurately measured with the help of a pupil distance meter. If there is a customer with a large error in pupil distance, how should they adjust it? From the perspective of vision protection and eye health, new myopia glasses should be compromised based on the optical center distance and pupil of the original lens.