A progressive multifocal ophthalmic lens and its design method
A progressive multi-focus, design method technology, applied in glasses/goggles, optical components, instruments, etc., can solve the problems of long channel length and insufficient vision in the near-sighted area, and achieve short channel length, large design range, and increased The effect of visual range
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[0025] In this embodiment, the lens to be processed is the rear surface of the inner progressive lens, the radius R of the lens is 36mm, and the focal power of the far zone is -4 diopters, near vision It is -2 diopters, and the focal power of the lens is 2 diopters. Set the lens gradient channel length h as 28mm, and the distance L from A to the lens center point 0 as 14mm. The lens material has a refractive index of 1.523. The lens design steps are as follows:
[0026] 1. Set the coordinates of the lens as follows: the positive direction of the y-axis is horizontal to the right, the positive direction of the x-axis is vertically downward, and the positive direction of the z-axis is perpendicular to the paper and points to the reader. The unit of length is mm. Let A be the reference point for far vision on the lens, B the reference point for near vision on the lens, and the line connecting point A to point B goes down the x-axis, called the meridian, and the length is h. ...
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