Click here for a video explaining lens types and thickness.

At eyemartexpress.com, all complete pairs come with CR39 plastic lenses standard. Plastic is lightweight, tints well for sunglasses, accepts a scratch resistant coating, and overall is suitable for most prescriptions. Patients with a prescription over +/- 2.00 may prefer the thinner appearance of polycarbonate lenses.

During the checkout process, you can upgrade to polycarbonate lenses. Polycarbonate lenses are the safest lens available as well as being thinner and lighter than standard plastic lenses. Polycarbonate lenses include a free ultraviolet (UV) filter.

High-index lenses are a plastic alternative to polycarbonate used for stronger prescriptions. Due to the refractive qualities of high-index, these lenses are the thinnest available. This allows those with stronger prescriptions to have more frame options.

These lenses include a special coating that allows the lenses to be clear for use indoors, and become darker when exposed to strong sunlight outdoors. The Photochromic lenses darken when exposed to UV (ultraviolet) rays. Once indoors, the lenses will gradually return to their clear state.

Single vision lenses have one fixed correction over the entire lens area. They can be used for near, intermediate or distance vision. If your prescription does not include an add power, then you only require single vision lenses.

A bifocal lens is divided into two visual powers by a horizontal line. “Flat top bifocals” are designed with the top section of the lens usually used for distance vision, and the bottom section used for near vision. These are the most common type of bifocals because they allow people with myopic or hyperopic conditions to use a single pair of glasses for both distance and near vision.

Also known as multifocal, these lenses provide a smooth transition between distance to reading power, serving the same purpose as bifocals without the conspicuous horizontal line. Many patients prefer the appearance of “No-Line” over traditional bifocals.

This premium coating is ideal for night driving or frequent computer use. It not only improves your vision, it also reduces the light reflected by your lenses, so others can see you better. The coating increases the light transmission through the lenses, which reduces reflection and allows you to have clearer, sharper vision.