Contained here is a review about bifocal contact lenses, where you can check out the lens working and the possible problems, which will help you choose the best one that suits your needs.
Bifocal contact lenses are most commonly used to correct the age related eye disorder, known as presbyopia. The common sign of presbyopia is, when a person has difficulty in focusing on close-by objects and has difficulty in reading. It mostly occurs after the age of 40, and is often a sign of aging. Bifocal contacts are a type of multi-focal lenses, as they have two focal points, which enable the user to adapt his vision to see both nearby and faraway objects. Read the reviews to gain valuable insight on the advantages of using these lenses and how they might help you in vision correction.
How Do Bifocal Contacts Work?
These lenses, as the name suggests, contain two focal points or optical powers on each lens, one for near and one for distance vision. These may be placed in different ways. Thus, there are two main types of lenses based on how the two optical powers are arranged on the lens:
- Translating or alternating vision bifocal lenses, which are very similar to bifocal glasses, where the focal point for distance is above the near vision power. Thus, when a person looks downwards, the near vision is used and when the person looks up or forward, the distance power comes into his line of sight. This is made possible by the use of gas permeable or GP lenses, which remain stationary even though the eyeball moves.
- Simultaneous vision contact lenses usually contain different focal points for near and far vision, in the form of alternating concentric rings. They can be both GP lenses or soft lenses. Soft bifocal lenses with simultaneous vision, usually have the near vision focal point on the middle, and the distance vision around it in the form of rings. GP has distance vision in the center and near vision in concentric circles around it.
- Difficulty in adjusting to the two different focal points is the most common issue regarding the use of these lenses. This is not for too long though, as the user soon becomes accustomed to the lens and gets comfortable with it.
- During early use, the user may have blurry vision and at times, see shadows and glare.
- Bifocal lenses need to be fitted on to the patient’s eye by a specialist, and though you usually get a free trial pair, it can still cost you to get them fitted.
- As with any other contact lens, you need to take care while using bifocal contacts.
There is a huge variety in the types of bifocal contacts that you could choose from, some of them are:
- Rigid Gas Permeable or RGP Contact Lenses are called so, not because they are hard, but because they do not move even though the eyes move, thus enabling the user to use them like bifocal glasses, for reading or for viewing distant objects. They are called gas permeable because they allow oxygen to reach the eye, thus making them more comfortable to use. They also last longer than normal soft lenses and are damaged less easily. They provide better quality of vision, once they have been properly fitted. The downside is that you may take time to get used to RGP lenses.
- Soft Lenses are the most commonly used varieties and are used even for cosmetic purposes. They can be disposed off after a short period of use. They easily fit over the eyes and don’t require much time to get adjusted.
- Silicone Hydrogel Lenses are a new type of soft lenses that are trying to achieve the comfort and oxygen permeability of GP lenses by using silicone.
The cost depends on the type of contacts that you will be buying. The RGP lenses are a bit more expensive when compared to the soft lenses, however, they do last longer than soft lenses, which have to be disposed off after some time. On the other hand, there is a risk of breaking or losing RGPs, which is not the problem with soft contacts. So, if you are a careful user, you can consider RGP contacts as your first choice. However, if you are looking for an everyday, easy to use option, or want to change your eye color as well, soft lenses are better suited for you.
Contact lenses have evolved greatly over the years and are now quite comfortable to use. Apart from the time taken to get used to wearing them, these contacts are very useful and should be used by anyone, who would like to get rid of their spectacles. There are other alternative lens types, which include monovision, where one eye has a nearsighted lens and the other has a lens with distance power. Alternatively, you could use lenses for, either distance or reading, and use glasses for the other corresponding ailment. Another option could be to do a laser eye surgery or eye accommodative surgery.