Mature Vision
Most changes in vision occur in the early and later years of life. Although some people may discover they have nearsightedness -- or difficulty seeing at a distance -- as late as their mid-20s, vision typically stabilizes during the late teen years. From then until around age 40, vision typically changes little, if at all.
Presbyopia - Age-related loss
of close-up vision
At about 40 years of age, seeing to read or do close work such as sewing
may become difficult. This is known as "presbyopia." Presbyopia, a name
that comes from the Greek words for "old eye," occurs because the crystalline
lens, an essential component of the eye's refractive, or light-bending
structure, loses flexibility as it grows thicker with age. This lack of
flexibility affects the ability to focus on close objects.
Generally, by around age 45, reading glasses may be required for nearby tasks. If near- or farsightedness is also present, a number of vision correction options will be evaluated to best meet your needs.
Spots and floaters
People of every age may at times see spots and floaters, which appear
to look like specks of material, cobwebs, thread-like strands or showers
of brilliant crystals. During the middle years of life, they may become
more frequent. These are optical defects that occur, as the vitreous,
the jelly-like body in the main globe of the eye, becomes less jelly-like
and more liquid as time goes by. This change is not always uniform, and
so the mixture of jelly-like and liquid materials can affect the passage
of light to the retina.
The result is seen as 'floaters.' Although spots and floaters are typically not of concern, they should be evaluated promptly. If you suddenly experience a large number of floaters, don't delay in making an appointment. A sudden change may signify that something is wrong.
Glaucoma
For adults, it is important to schedule regular eye examinations in order
to detect and treat any occurrence of glaucoma in its earliest stages.
Most types of glaucoma occur without the presence of any symptoms and
can only be detected during a routine eye examination. Glaucoma occurs
when fluid pressure inside the eye rises, cutting off the blood supply
in the very small arteries carrying food and oxygen to the retina and
causing loss of side vision or blindness if left untreated. It is a condition
that can be arrested or slowed down but not reversed, so early detection
is essential. Treatment often involves special eye drops or medicine,
but, in some cases, surgery may be required. If detected early, chances
that vision can be maintained are usually very good.
Retinal disorders
Retinal disorders have a greater chance of developing in older adults,
due to the aging process. These often impair central vision. Advances
in eye and health care have made treatments more successful, with chances
of maintaining good vision now better than ever. Conditions once considered
sight threatening may now be successfully treated if diagnosed early.
Suggestions for better sight
• Be aware of your visual limitations and compensate for them.
• You may need more light for reading and other close tasks. Move the lamp closer to you and/or use a larger watt bulb. It is a fact that a 60 year old needs three times as much light as a 20 year old to see near work as easily.
• Side vision and reaction time may reduce with age. Keep this in mind while driving or walking near traffic.
• Limit night driving to well-lighted roads; keep headlights and windshields clean; and be visually aware of traffic.
• Be sure to keep glasses clean.
• Be sure to wear distance spectacles if they are prescribed for you. While you may feel that your distance vision is as good as it was when you were younger, very often this is not the case.
Although natural vision changes can't be prevented, they need not mean giving up activities such as driving your car. By practicing good health habits and having regular eye examinations, you should be able to continue an active, productive and independent life.
