Single vision lenses are for standard glasses prescription. These lenses have only one vision area in the entire lens, and the correction area can be long-distance, medium-distance, or reading.
Long distance-If you wear glasses all day, but don't need bifocal/zoom, or you mainly need these glasses to see far things.
Middle distance-If you mainly need these glasses to work with computers or other things at arm distance, or you are a musician, you need these glasses to read music.
Reading-if you need to read things close to you.

A bifocal lens refers to a lens with two focal points. A small part of the eyepiece lens is reserved for near vision correction. The rest of the lens is usually distance corrected. When focusing on a far point, you look up and pass through the distance part of the lens; when focusing on reading material or detailed work beyond 18 inches, you look down and pass through the dual focus part of the lens.

Progressive lenses are closest to the natural vision of a pair of prescription glasses. They are not just close corrections defined in one lens. On the contrary, progressives provide a smooth transition from distance, through the middle to near, and all corrections are included. This escalating prescription means that you can look up into the distance, look forward to the computer in the middle area, look down, and comfortably read close and do fine work.

The lens index is a number that describes how thick or thin your lens is. The higher the refractive index of the lens, the thinner it is. High prescriptions require high refractive index lenses, and low prescriptions require low refractive index lenses.

High refractive index lenses are thinner and more powerful lenses. They are lightweight and stylish, but are mostly reserved for those with higher vision correction needs. Although most prescriptions are compatible with more than one specific index, it is up to you to decide which one suits your personal needs!

The difference between the refractive indices of the lenses of the glasses can have a huge effect. Deciding which one you should eat depends on your prescription and your lifestyle. Thicker lenses are cheaper, but can only meet lower vision correction needs. Thinner lenses are lighter (more stylish!) and can meet a variety of visual needs, including higher prescriptions.

Most suitable for low-SPH (0 to +/-2.0) and CYL (0 to +/-1.5). If your prescription is higher, we recommend that you upgrade your lenses.)

These lenses are made of a special polycarbonate material. Used for SPH (+/-2.0 to +/-4.0) and CYL (+/-1.5 to +/-2.0) low to moderate prescriptions.

Thin and light lenses provide the best value for people who have a moderate prescription and want a light lens. Suitable for SPH (+/-4.0 to +/-6.0), CYL (+/-2.25 to +/-3.0) prescriptions.

These lenses are great for people with high prescriptions. It is recommended to use SPH (+/-6.0 to +/-9.0) and CYL (+/-3.25 to +/-4.0) prescriptions for best results.

The thinnest and lightest lens on the optical market. These lenses are recommended for prescriptions with SPH higher than +/-9.0 and CYL higher than +/-4.25.

Lenses are an ideal choice for all glass’s wearers, especially office workers and individuals who use digital devices for a long time. Help protect your eyes from harmful blue light and reduce eye fatigue.

When you go out, the lens will automatically darken due to the sun's ultraviolet rays! Same quality as your doctor's office.

Transitions lenses are world famous photochromic lenses, including patented photochromic lenses