For all of us, as we grow older, changes occur in our organ systems, including our eyes. These changes can have a significant effect on vision.
Failing near vision (presbyopia)
The ability of the lens inside an eye to focus gradually decreases with age. This results in many people over the age of 40 years requiring reading glasses to see clearly for near-sightedness. These reading glasses overcome the requirement of the lens in the eye to change its focal length. They need to be gradually increased in power as the eye loses its focusing ability, but the use of reading glasses does not accelerate or retard this process.
In the over 60-year-old age group reduction in central vision can occur as a consequence of degenerative changes in the part of the retina which we call the macula. The macula is the central part of the retina which is used for reading and other fine visual tasks. The cause of macular degeneration is poorly understood but is believed to be related to exposure to high levels of light over a prolonged period.
The use of sunglasses may decrease the incidence of macular degeneration but most forms of this condition are slowly progressive. If you are known to have macular degeneration and experience a sudden change in your vision with distortion, reduced near vision or blurred central vision, you should see your doctor or ophthalmologist without delay.
More information on macular degeneration.
Opacification (clouding) of the lens within an eye is called a cataract. The incidence of cataracts increase with age and some cataracts may progress to require surgery. Many people over the age of 60 have cataracts, but not all require surgery. Surgery is usually only advised when the vision has become blurred to the extent that normal visual tasks are not able to be performed well.
More information on cataracts.
Glaucoma is an ocular condition in which the pressure inside the eye is too high and is causing loss of vision. Glaucoma can run in families and is seen more commonly in the over-50 age group. Most people are unaware that they have the disease until it is in an advanced state. It is important to have regular eye examinations and be screened for glaucoma, especially if there is a family history. In most cases the condition can be successfully treated with eye pressure lowering drops.
More information on glaucoma.
For further information and support talk to an optometrist or eye specialist. Optometrists are listed in the 'Yellow Pages' of your telephone book. Eye specialists are listed with registered medical practitioners at the front of the white pages of your telephone book.
Original material provided by Auckland Eye, and reviewed May 2005. Edited by everybody.