LianSan Progressive Multifocal Blocking Computer Vision Care and Reading Glasses Review

Plastic frame. Resin lens. non-polarized. Lens width: 2.13 inches. Asymptotic multifocal glasses are the upper optical area of the lens used to look far and the lower optical area used to look near. The degree of the middle gradually change, which used to look at the intermediate area. We change the curvature of the lens surface from top to bottom, adding positive diopter, which result in the effect of visual correction. Because the degree is gradual, so the glasses won't cause visual fatigue. People who wear progressive multifocal glasses will have clear vision at all distances in the visual range. Most people wear progressive multifocal glasses need about a week of adaptation, but the adaptation period varies from person to person, walk slower when feel dizzy.As the two sides of the lens is astigmatism disorder district, you need to turn around the neck and eyes in order to see objects on your both sides clearly. When go down stairs, please lower your glasses and use the top area. You'll feel safe and comfortable. Dimension : Lens height:40mm, Lens width:54mm, bridge:17mm, temple:137mm. Package Includes: 1 * reading glasses,1 * glasses case and 1 * cleaning cloth.