Unfortunately, overnight wear of contact lenses is not a good idea for everyone. And for many people, wearing contact lenses during sleep increases the risk of eye problems. The other alternative is daily disposable contact lenses. Many eye care professionals and contact lens wearers feel that they offer the best of both worlds: They are convenient because no lens cleaning is required, and they are healthy because there is no day-to-day accumulation of lens deposits, and no overnight wear.
Extended wear contacts are, most typically, contact lenses that can be worn continuously for up to six nights and seven days. With the advent of silicone hydrogel lenses, which are better at letting oxygen through the lens to your eyes, there are now also continuous wear contacts that can be worn up to 30 days straight.
Talk to your eye doctor about the best type of lenses for you. Get regular eye exams to keep your peepers healthy and make sure your prescription stays up to date. Soft Contact Lenses. They’re made from a special type of plastic mixed with water. The water content lets oxygen pass through the lens to your cornea.
Monovision, then, involves wearing a contact lens on the non-dominant eye to correct near vision, and a contact lens on the dominant eye (if needed) to correct distance vision. Monovision works because the brain is tricked into thinking that the contact lens is actually a part of the natural eye.
Multifocal and bifocal contact lenses are designed for people with presbyopia who have trouble focusing on close-up objects. They work by combining correction for distance and near vision into the same contact lens. Multifocal lenses have improved significantly in recent years due to better technology.
Gas permeable contact lenses are also called RGP (Rigid Gas Permeable) contact lenses, and oxygen permeable lenses. GP designs are differentiated primarily by size. For many years virtually all GP lenses were fitted significantly smaller than the corneal diameter, typically 9 to 10 mm in diameter.
Spherical contact lenses have the same lens power throughout the entire optical part of the lens to correct myopia (nearsightedness) or hyperopia (farsightedness). Toric soft contact lenses have different powers in different meridians of the lens to correct astigmatism as well as nearsightedness or farsightedness.
What are toric contact lenses? A toric lens is a contact lens that's shaped in a particular way. Standard contact lenses have a spherical surface: think of a slice of the side of a beach ball. A torus, in contrast, is a geometric shape that looks like a donut. A toric lens is shaped like a slice of the side of this donut.