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We offer most of the high-quality lenses for our budget-conscious customers, you may choose from our variety of lenses to fit your prescription and other purposes. Here are the types of lenses Firmoo.com provides, and the basic add-ons for the lenses. For the consideration of the total cost, we do not provide the lenses above index 1.67.

Standard index 1.5 lenses are the basic CR-39 lenses, come with anti-scratch hard coating, and are shatter-resistant, suitable for spherical power +/- 2.00 or below, and cylindrical power +/- 1.50 or below.

Index 1.57 spherical lenses are with anti-scratch hard coating. This higher index lens greatly reduces the thickness of the lens edge. This is suitable for spherical power of +/- 4.00 or below with cylindrical power +/- 2.00 or below.

Index 1.57 aspherical lenses are even thinner and lighter than 1.57 spherical lenses. These lenses come with anti-scratch and anti-reflective coating, greatly reducing the image distortion, suitable for spherical power of +/- 4.00 or below, and cylindrical power of +/- 2.00 or below.

Polycarbonate lenses (PC lenses) are 10 times more impact-resistant, lighter and thinner than normal plastic lenses (Resin lenses). They can also offer 100 percent UV protection and scratch protection, which make polycarbonate lenses the best lens option for children's glasses and safety glasses, as well as for any rimless glasses of adults. PC lenses are only available for single vision glasses with no access to add the extra tint and photochromic color.

Super thin index 1.60 lenses are the high index lenses which are suitable for wearers with spherical power of +/- 6.75 or below, and with cylindrical power of +/- 3.00 or below.

Ultra thin index 1.67 lenses are thinner and lighter than lenses of index 1.60, and are most suitable for those with spherical power above +/- 7.00 and cylindrical power of +/- 4.00 or below.

As thin as possible index 1.74 lenses are the highest index materials which are used primarily for the strongest prescriptions, greatly minimizing the thickness and weight of lenses. They are suitable for wears with spherical power above +/-8.00 and cylindrical power from+/-4.00 to +/-5.00. Additionally, the higher the prescription is, the more evident an effect will be, in the light of reducing the thickness and adding outstanding comfort.

Polarized lenses contain layers of special filter which will block intense reflected light and terminate the harmful glare from a horizontal orientation. With those polarized layers, light will be filter into one direction so that we will be offered better vision in a higher contrast. Polarized lenses definitely are your best company when enjoying your life outdoors, enhancing experiences of boating, skating, mountain biking and driving. We currently use the CR39 1.50 index lenses for fitting polarized sunglasses or polarized prescription sunglasses. The color of the polarized lens is G-15(Grey green).

All our lenses come with anti-scratch hard coating to avoid lenses being easily scratched, ensuring vision clarity and durability.

Anti-reflective coating reduces the reflection of light, enhances the light transmission through the lenses, is particularly good in driving and long time work in front of computers, and is also good for wearers' aesthetic appearance. Anti-radiation coating blocks harmful radiations from different sources.

The UV coating is added with a great beneficial purpose that can reflect harmful UVB and UVA rays in the sunlight (Overexposing to the ultraviolet light will increase the risk of getting cataract ,retinal damage and other eye problems). Adding this coating will not change the appearance of the lenses.

Tint is the permanent colors added to your lenses, making your eyeglasses a pair of prescription sunglasses.

Photochromic lens darkens when exposed to the sunlight, and resumes clear when wearer is indoors. This option makes your eyeglasses a perfect pair of prescription sunglasses while outdoors. For the first time user, please do place them on the windowsill（outdoor）in the sunlight to activate the turning.

Bifocals are created by molding a reading segment into a primary lens and are available with the reading segments in a variety of shapes and sizes which offer convenience to help people see at multiple distances without taking their glasses on and off constantly. Those glasses have only two ranges of vision — near and far — with a distance zone established in the upper portion of the lens, and the lower zone enabling near vision tasks such as reading located on the bottom half of the lens. The zones are separated by a noticeable line

Progressives sometimes called "no-line bifocals," eliminate the visible lines of bifocals and hide the fact that you need reading glasses. These lenses allow a smooth, comfortable transition from one distance to another. They are a much better option for active, multitasking people. They also avoid the discontinuities (image-jumps) in the visual field created by bifocals and are more cosmetically attractive. The minimum lenses height for bifocals and progressive are commonly 32mm or greater.