It is often disgusting for people who are suffering from both short and long sightedness. Bearing with the eyeglasses for dealing with these issues is very much difficult. However, this problem can be simply avoided by the use of bifocal contact lenses. These lenses are especially meant for providing good vision to people who suffer from presbyopia which includes a diminishing visible ability to focus on near objects. Various bifocal lenses are available today made of soft, rigid and gas permeable materials. The basic feature of bifocal contact lenses is that they have two prescriptions in the same lens. Various designs of bifocal contact lenses are available including alternating design, simultaneous design, concentric design, translating design and so on. Alternating designed bifocal contact lenses have half the lens with distance powers and half the lens with power for near objects. As the pupil alternates between the two powers based on your upward or downward gaze, they are termed as alternating designed bifocal contact lenses. Simultaneous designed ones are those where the lenses blend the powers of both distant and near sight prescriptions enabling you to see through both the distance and near powers at the same time.
Concentric bifocal contact lenses have a prescription in the center and one or more rings of power surrounding it. The central portion of these lenses works on near vision while the outer part works on distant vision correction or vice versa. Aspheric designs are generally intended for multifocal lenses. The distant and near vision powers are located in the center of the aspheric design of bifocal contact lenses. The near correction may be at the center and the distant power correction at the surrounding portion. It is very much necessary to know the features and problems associated with each and every model of bifocal contact lenses from an eye professional and get the right pair that is suitable for your eye and get dual benefits with a single solution.
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