Visual (Vision) Impairment is a reduction in vision, usually associated with age that cannot be corrected by prescription glasses, contact lenses, medicine or even surgery. It can range from low to severe. Visual impairment is a huge problem affecting a lot of people worldwide causing normal daily activities such as walking, reading or driving to become impossible or very challenging.
Refractive errors are vision problems that happen when the shape of the eye keeps you from focusing well and it is the major cause of vision loss around the world. A clouding or loss of transparency of the lens in the human eye as a result of tissue breakdown and protein clumping. There are many causes of cataracts, including aging, cortisone medication, trauma, diabetes, and other diseases. Cataracts affect most people during their old age. Symptoms include double or blurred vision and sensitivity to light and glare.
Optical aids for low vision can range from reading glasses, magnifiers to small telescopes depending on the severity of visual impairment. Such devices differ from the reading glasses or the magnifying glasses that we are familiar with. Low vision devices are never all purpose devices and are built with a very specific use in mind. We should think of the low vision optical aids as specific where one device may be used for reading a mail, another for watching movies, and yet another for seeing menus at a restaurant.
Low vision devices for viewing distant objects
The optical low vision aids are mostly powerful lenses that magnify objects so that people with visual impairment can see them clearly. These lenses may come in the form of spectacles for reading books or in form of a telescope for viewing far away objects. Sometimes such lenses are also mounted on the spectacles to give the device a degree of versatility.
Low vision optical devices
They make it easier to use one’s existing vision for specific tasks, like knitting or watching a football game. Unfortunately, low vision aids do not bring back the vision that has already been lost, but they will maximize one’s remaining vision and help one to enjoy life as a regular person. There are hand magnifiers, stand magnifiers, pocket magnifiers, and they come in all sorts of shapes. There are magnifiers that look like mini-telescopes and some that look like glasses. Some can be worn around the neck and some come attached to a desk lamp.
Some have built in lights. Also the lenses used in the devices can also be altered to change the strength of the lenses as per the requirements of the visually impaired person. Practice is the next step which is very important. Just as an amputee must learn to walk with his new prosthesis, a person with low vision must practice using adaptive aids until they become second nature.