More About Contact Lense
Replacement Schedules and Types of Contact Lenses
...back to design and wearing schedules of contact lense.
Disposable and Planned Replacement Contacts
The disposable and planned or frequent replacement terms refer to replacement schedules, which is the safe wearing interval of contacts before you need to throw them away. For example, gas permeable lens is discarded after a couple of years. But soft lenses have various replacement schedules:
- Daily (one-day) disposable -- replaced every 1 day
- Disposable (extended wear) -- replaced every 1 week to 2 week
- Frequent/planned replacement -- replaced every 1 month to several months
- Conventional -- replaced every 1 year
Today disposable lenses become more and more popular because they are affordable as well as healthy for the eye. Depending on their replacement schedules you don't need to
care for them every day. Disposable lenses for astigmatism correction or varying shades color contacts are also available
in the market.
Colored, Special Effects and Toric
Colored contacts are available in non prescription as well as in spherical and toric designs that require prescription. They are available for cosmetic and fashion wear, which are usually "plano" or nonprescription type. If you wear colored lenses you will be able to match your costume with a pair of green or blue contacts.
There are many color lens designs that cater special occasions such as scary and fancy lenses for Halloween, or theatrical and
special effects for film productions. The color effects may range from adding a little blue or green enhancement to the ones that completely change your eye colors. If you have astigmatism there is colored toric lens.
If you have astigmatism there are toric lenses
that answer your needs. Toric lenses have as much variations as spherical soft lenses. They have both daily and extended wear schedules. There is also all range of replacement schedules from daily disposable to conventional lenses. Toric lens is also available in color.
Bifocal Contacts
As you reach presbyopia age you may experience difficulties focusing on up-close object. But don't worry becoming too old to wear contacts; there are contact lens options that correct aging eyes:
- Progressive lenses correct your distance vision in the central part of the lens. And your intermediate and near distance visions are corrected with the outer regions of the lens. Some newer aspheric lenses are available in planned replacement and disposable modalities.
- Multifocal or bifocal contacts correct vision with at least two powers. There are variations in bifocal lens designs. In concentric or annulus designs, the central part of the lenses correct near vision and the outer rings correct intermediate and distance visions. In translating contact lens designs you'll see a line separating the powers with distance vision on the top and near vision at the bottom.
