Low vision.
When standard glasses or treatment cannot fully restore sight, understanding the cause can help you find practical ways to use your remaining vision and protect eye health.
What low vision means.
Low vision is reduced sight that cannot be fully corrected with ordinary glasses, contact lenses, medicines or surgery. It can make reading, recognizing faces and everyday activities more difficult.
The term describes an effect on vision, rather than one diagnosis. Several diseases can lead to persistent sight loss, while some causes of reduced sight, such as cataracts, may improve with treatment.
Four important causes.
Macular degeneration.
Damage to the macula, the central part of the retina, can cause blurred central vision or a central blind spot. Dry AMD generally progresses more slowly; wet AMD involves abnormal blood vessels that leak and can cause faster sight loss. Age, family background, ancestry, smoking and vascular health can influence the risk assessment.
Diabetic retinopathy.
Diabetes can damage small retinal blood vessels. Leakage can cause swelling, and blocked vessels can reduce the retina’s blood supply. The condition may have few symptoms early on but can eventually cause serious vision loss. Duration of diabetes, blood sugar, blood pressure, cholesterol and smoking history are relevant to risk.
Cataracts.
A cloudy natural lens can reduce the light reaching the retina. Cataract surgery can improve vision when the cataract is the main cause, although other eye disease can affect the expected result. Age, diabetes, smoking, heavy alcohol use and ultraviolet exposure are relevant risk factors.
Glaucoma.
Glaucoma damages the optic nerve and can reduce side vision. It includes open-angle, normal-tension, angle-closure and secondary forms. Assessment considers pressure, corneal thickness, optic-nerve appearance, family history, refractive error and past eye injury, as well as diabetes, migraines, blood pressure, circulation and your wider health history.
Supporting your eye health.
Age and genetics are not choices. Health conditions such as diabetes or high blood pressure also are not simply a matter of willpower. Working with your clinicians on manageable risk factors can support eye health without guaranteeing that disease will be prevented.
- Know your family’s eye-health history and keep regular health appointments.
- Follow your diabetes, blood-pressure and cholesterol care plans.
- Choose regular activity and a balanced diet that fit your health needs.
- Avoid smoking and protect your eyes outdoors.
- Tell your eye doctor about changes in sight and follow an examination schedule based on your risks and findings.
Making daily tasks more manageable.
An eye assessment can identify the cause of vision changes and whether treatment may help. If reduced vision persists, ask about vision aids, better lighting, magnification or vision rehabilitation.
The right support depends on the task you want to do and your remaining vision. Ask your eye doctor whether specialist support or referral would be useful.