Do you know what is: OPTICAL DESGIN of optical lenses?

When purchasing lenses, various terms often come up, such as material characteristics, optical design, UV protection, anti-blue light, digital lenses...

Today, let's talk about the most frequently terms: OPTICAL DESGIN.

Optical design is one of the key considerations in eyewear. Excellent design coupled with perfect implementation determines whether the expected vision correction effect can be achieved.

Refractive Error

Refractive error refers to a permanent or temporary change in the eye's axis, which causes the image of an object to not fall correctly on the retina. If the image in front of the retina, is Myopia; and behind of the retina, is Hyperopia.

After correction, some of the images still fail to fall on the retina, a phenomenon known as astigmatism.

• Optical concave lenses can be used to correct Myopia
• Optical convex lenses can be used to correct Hyperopia
• The asymmetric surface design on the back surface can be used to correct A

Basic types of lenses

Based on optical design categories, lenses can be divided into single vision and Progressive Lenses.

According to the processing method, lenses can be divided into Stock Lenses and RX Lenses. Stock Lenses have a 25-degree interval and can be mounted on frames for wearing in eyeglasses stores.

RX lenses are optical blanks before processing, and are processed into specific optical designs based on prescriptions using free-form surface technology.

How to choose?

• Single-vision lenses

Most common and easiest to adapt to. Aspherical is better.

The peripheral area of lens is thinner and lighter, with good aberration correction optical performance. It is generally used on the front surface, because the back surface usually needs to be designed for astigmatism.

• Multifocal lenses

The requirements for lens power differ between near vision and far vision.

Multifocal lenses are primarily designed to accommodate different refractive requirements for distance and near vision.

Suitable for older individuals with diminished eye accommodation.

• Progressive lenses

Aim for a smooth transition between viewing zones.

It can be tailored for different application scenarios, such as driving, indoor and outdoor use, office settings, and for different age groups, including young people and elders.

The design of the usable area also varies, The designs of the usage areas are also varied, including hard design, soft design, long corridor, short corridor, etc. Wearers can choose the most comfortable lenses according to their own situation.