What is the "mirror eye distance"? What does it have to do with glasses?
The so-called "lens distance" is defined as the distance between the inner surface of the lens and the apex of the cornea.
The distance between lenses of contact lenses is 0, because it is attached to the corneal surface. The effective degree is the degree of the lens. The eyeball looks through the optical center to the maximum extent. The visual effect is almost no reduction or deformation, which is closest to the real imaging effect. The vision is wide, just like the naked eye.
When we perform optometry, whether it is a comprehensive optometer or a trial stand, we default to the degree of 12 mm lens eye distance.
Because the plate holder is an integrated nose support, it should be less than 12 mm from the eye after wearing it on the face.
The eye distance of metal lens frame is generally larger than that of plate frame,
In my daily work, I have been working for so many years, and I have observed customers' reactions after matching glasses,
The comfort of wearing a plate frame is better than that of a metal frame!
If the old glasses are replaced with metal frames by plate frames, if the customers' eyes are sensitive, they may need to adapt in the early stage.
If the old glasses are changed from metal frames to plate frames, many times customers will nod with satisfaction without getting used to wearing new glasses.
I'm curious why the plank frame is more comfortable?
The distance between the mirror eyes of the plate frame is small, and the field of vision will be wider. It is more comfortable to see through the optical center point. It can be imagined that the distance between the eyes of the mirror is infinitely small, which can only be seen through the center point. The metal lens frame has a large eye distance, so the field of vision will be reduced, and the human eye can easily see the edge of the lens. The imaging effect of the lens edge is very poor. You can pull your glasses far away, and the objects you see are completely distorted, which is the truth.
"You'll faint when you see something you shouldn't!"
Two benefits can be gained if the distance between lenses is small:
1) Good imaging effect, closer to real imaging
2) It is more comfortable to see through the optical center point without seeing areas with poor imaging at the lens edge. Especially in the case of large frame, it is more prominent.
In the gradual multifocal lens fitting, if the customer feels dizzy, the vertigo can be greatly reduced by adjusting the nose support and reducing the distance between the eyes. The near-term vision will also be greater.