Eventually everyone experiences presbyopia. This is the normal aging process of the eye, which begins around the age of forty for most people, and is caused by the gradual loss of elasticity in the natural crystalline lens of the eye. The lens loses its ability to change shape the way it used to, and fails to bring the light rays of near objects into sharp focus. Of course a nearsighted person over the age of forty can see near objects clearly with the naked eye, but will have difficulty doing so if he is wearing glasses or contact lenses that correct his myopia. Read the rest of this entry »
SHARP VISION
As many see it, the main advantage of hard lenses is that when fitted properly they provide the sharpest visual acuity for all the refractive errors—even better than spectacles can. It’s not uncommon for those who have nearsightedness, farsightedness, presbyopia, and most degrees of astigmatism to report 20/10 vision—that’s better than “normal”! Your prescription can be accurately ground into the front surface of a hard lens, and its smooth, firm, domelike undersurface, combined with the tears trapped beneath, forms a perfect refracting surface for the eye. A conventional soft lens, on the other hand, conforms to the shape of the cornea much like a tablecloth drapes over a table and so cannot completely correct astigmatism originating in the cornea. There are special new soft and gas- permeable lenses capable of correcting a relatively high degree of astigmatism, but hard conventional lenses are still the best for consistently correcting the higher amounts of astigmatism; besides, not everyone can deal with the soft lenses‘ disadvantages. Read the rest of this entry »
Vision is a dynamic, changing process that is highly individualized. No one sees exactly the same as you do. No two eyes— even your right eye compared with your left—are quite the same. Nor do they remain the same as you go through life.
Though the eye is quite durable, it’s also an irreplaceable, delicate, sensitive, and highly sophisticated organ. Your eye is directly connected to your brain by the optic nerve and is closely related to other systems of your body. It shouldn’t be considered independently, and before you walk off with a pair of contact lenses you should undergo a complete medical eye examination by an ophthalmologist. Read the rest of this entry »
The lens in your eye can only adjust so much in an effort to bring objects into focus. When the eye can’t focus properly, there are four basic conditions that may be the cause. These are called refractive errors (myopia, hyperopia, astigmatism, and presbyopia). Luckily, all are correctible with contact lenses or spectacles. Most of these refractive errors are a result of heredity.
Nearsightedness (Myopia). This occurs when the eyeball is too long for the lens’s focal capacity. The patient’s cornea and lens focus the image of a distant object in front of the retina, so vision is blurry except when looking at nearby objects. Myopia affects one quarter of the world and seems to be on the rise, though it’s a mystery why. Most contact lens wearers are myopes. Read the rest of this entry »
Contact Lenses Care .
