Glasses can be classified in various ways depending on the criteria used. Here are some common classifications:
- Material: Glasses can be made from different materials such as glass, plastic, polycarbonate, and others.
- Lens type: There are several types of lenses, including single vision, bifocal, trifocal, and progressive lenses.
- Frame style: Glasses frames can be classified into several styles such as full-rim, semi-rimless, and rimless.
- Prescription type: Glasses can be prescription or non-prescription. Prescription glasses are customized to correct specific vision problems such as nearsightedness, farsightedness, or astigmatism. Non-prescription glasses are used for fashion or protection from the sun.
- Usage: Glasses can also be classified based on their usage, such as reading glasses, computer glasses, safety glasses, sports glasses, and sunglasses.
- Shape: Glasses can be classified based on their shape, such as round, square, oval, aviator, and cat-eye.
