What one must know of eyeglasses

Tuesday, December 8th, 2009 at 1:34 pm Post in Eyeglasses

People with presbyopia are supposed to buy reading glasses from eye doctors, rather than simply pick up one pair from drugstores. On one hand, those one-size-fit-all reading glasses are problematic for people with different prescriptions in two eyes, resulting in side effects such as headache. On the other hand, regular eye exams from eye doctors can detect underlying vision problems as early as possible.

While choosing eyeglass frames, the face shape, color of skin, eye and hair all should be taken into consideration. Photochromic lenses can change its color in different light conditions. These lenses become darker once exposed to UV light. Nowadays, most eyewear lines provide one or two frames in relatively larger sizes. Some typical brands are Chesterfield XL frames for men from Safilo, Prada frames from Luxottica and Silhouette frames.

There are many warning signs in children that may indicate the need for eyeglasses, including close TV watching or book reading, squinting, frequent eye rubbing, light sensitivity, excessive tearing and poor performance in school. Polycarbonate lenses are most usually recommended for children.

There are some tips that can help wearers prolong their eyeglasses lives. Trendy frames in some cases should be avoided because they become out-of-date quickly. New lenses put in old frames can save much money, especially in children whose prescriptions change more frequently. Spring hinge styles can better protect eyeglasses from breaking. Scratch-resistant coating is available for lens protection.

Regular computer users may feel uncomfortable with bifocal eyeglasses or reading glasses. In fact, computer screen reading requires intermediate vision, which can be provided by computer glasses, progressive lenses or trifocals. In some cases, occupational lenses are needed to provide task-specific vision.

Not all eyeglass lenses provide proper UV protection, such as some plastic lenses. Those lenses offer UV protection only if they are applied with UV coating. One superior lens material is polycarbonate, which has built-in UV protection.