Choice of lens surface treatment and optical lens
There are many ways to coat the surface of the lens, which can make your lens look more attractive and at the same time increase the transmittance of the lens.
Abrasion coating treatment: This hardening coating treatment method can make the optical lens more durable. The inner and outer sides of the lens must be hardened and more resistant to abrasion .
Anti-reflective film (also known as composite film): This film layer subtracts unnecessary reflected light on the lens, thus providing you with clear vision, but also Make you look more beautiful, because others see your eyes directly, not the offensive reflected light.
Diamond crystal: This is a new comprehensive processing method, it provides a good coating combination, it It has the functions of anti-wear, easy cleaning of optical lens and reduction of reflected light.
You should tell your eye care professional (or fitting staff) your hobbies, occupation, taste, etc. As long as the above points are combined, they can determine which Lenses made of a class of materials will provide you with a comfortable feeling and clear vision.
Glass lens: Glass lens is a very wear-resistant lens, but glass lens is heavy and easy to be hit It is broken, so it is not suitable for elementary school students and people who often spend time outdoors.
High refractive index lens: recommended for patients with deeper luminosity, high refractive index lens optical lens is lighter and thinner than standard lens, but high refractive index glass lens The weight will not be greatly reduced, only a little less.
1, Spherical power:
When light rays pass through a lens with power, the rays are bent or refracted.
(1) In a lens with positive power, light rays will gather or refract each other. The point where the rays of light converge is called the focal point, which appears behind the surface of the lens.
(2) In a lens with negative power, the light rays will diverge or refract each other towards the distance. If these rays are inferred or traced back to the light source, they will converge in front of the lens surface and form a focal focusing lens.
(3) The spherical power is related to the focal length or the distance between the lens and the focal point. More specifically, the spherical power is the reciprocal of the focal length calculated in meters. The lens power is expressed in diopters (D).
The formula is: degreeu003d1/focal length
2, astigmatism power (Cylinder):
Optical power also includes astigmatism, which is used to correct astigmatism. When light passes through a lens with astigmatism power, it will be aggregated or dispersed as if it passes through a lens with power. But the focus will be along a line instead of a point. The astigmatism is expressed in diopters (D), and is calculated in meters as the anti-aspheric mirror distance between the lens and the focal line or meridian.
3, Prismatic degree (Prismatic):
The prism can be used to correct a person's eyes that are not very coordinated in a straight line, for example, when the patient suffers from strabismus. When the eyes cannot be aligned in a straight line, the right and left eyes will see different images, which will cause blur or ghosting. The prism can make the images seen by the two eyes into a straight line, so the images seen by the two eyes can restore the sense of visual clarity. Prism power is like lens power, also measured with diopters (D), but in a different way. A prism degree of D is equivalent to measuring the prism from a distance of one meter from the prism to offset the beam of light by one centimeter from its original path.