Causes and Risk Factors of Vision Loss
There are many causes and risk factors of vision loss, ranging from genetic conditions and chronic diseases to infections, trauma, and environmental exposure. Understanding the root cause helps guide effective treatment and prevention strategies.
9 Causes/Risks below:
1. Refractive errors (myopia, hyperopia, astigmatism, presbyopia)
- The leading cause of vision problems globally.
- Easily corrected with glasses or contact lenses.
- If uncorrected, especially in children, can result in long-term visual development issues.
2. Cataracts
- Clouding of the eye’s natural lens.
- Common with ageing, trauma, or long-term UV exposure.
- Responsible for more than half of blindness cases in South Africa.
- Treatable with surgery.
3. Glaucoma
- Damage to the optic nerve due to increased intraocular pressure.
- Called the “silent thief of sight” because it develops slowly without early symptoms.
- Risk increases with age and family history.
- Requires lifelong treatment and monitoring.
4. Diabetic retinopathy
- A complication of uncontrolled diabetes affecting blood vessels in the retina.
- Preventable with diabetes control and annual eye exams.
- A major cause of blindness in working-age adults.
5. Age-related macular degeneration (AMD)
- Deterioration of the central part of the retina (macula).
- Affects fine visual tasks like reading or recognising faces.
- Risk increases with age, smoking, and family history.
6. Infections and trauma
- Eye infections like keratitis, uveitis, or trachoma (less common in SA today).
- Blunt force or penetrating trauma can cause immediate, irreversible damage.
- Workplace injuries and chemical exposure remain a concern in some industries.
7. Retinal detachment
- A medical emergency where the retina pulls away from the eye wall.
- Can result from injury, high myopia, or previous surgery.
8. Congenital and inherited disorders
- Some children are born with vision impairment due to albinism, congenital cataracts, or genetic retinal diseases like retinitis pigmentosa.
9. Lifestyle and environmental risks
- Smoking, poor nutrition, long-term UV exposure, and certain medications can increase the risk of visual damage.
Causes and Risk Factors of Vision Loss
In South Africa, limited access to eye screenings, delayed care, and poor diabetes control are major contributors to preventable blindness.
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