However, in selecting glasses for children, appearance should not be the most important factor. Special care should be taken to choose frames that are comfortable, safe, and well-made. Also, children may need more care and attention to fit the frames properly on their noses. They may benefit from use of straps, cables or flexible hinges on the ear-pieces of the frames to keep the glasses from falling off. For children, lenses made of safety glass or especially strong, shatterproof plastic materials are best.
Contact lenses are small, curved thin plastic disks that correct vision.
They are worn directly on the eyeball and cover part or all of the colored part of the eye. Some soft lenses, which are called daily wear lenses, are worn during waking hours only. Other soft lenses, called extended wear lenses, can be worn 24 hours a day. However, even if you have extended wear lenses, you should follow your doctor's advice on length of time they should be worn, as wearing lenses too long can cause irritation and infection. Soft contact lenses are made of plastic that absorbs water like a sponge, causing it to be completely flexible.