Optometrists are experts at providing treatment with lenses for all levels of vision. Eyeglasses are corrective lenses set in frames, compensating for focussing problems of the eye.
Light then focuses properly on the retina, resulting in clear vision.
Lenses can be made of glass, plastic, or polycarbonate. Glass is more durable and resistant to scratches, but is less impact resistant. Plastic and polycarbonate lenses are thinner and lighter and are more impact resistant, but scratch more easily. Polycarbonate is the most impact-resistant. Contact Lenses are small lenses made of plastic and are worn on the surface of the eye to correct focussing problems.