Specialty Vision · Vision Simulator
Retina
Macular degeneration (AMD) and other retinal conditions damage the macula — the centre of the retina — blurring or distorting the sharp central vision you use to read and recognise faces, while side vision is usually spared.
How retinal conditions can change vision
The retina is the light-sensing layer at the back of the eye, and its centre (the macula) gives you sharp, detailed, central vision for reading and faces. These conditions tend to affect that central detail — the opposite of glaucoma. Choose a condition and step through it.
Overview
The retina is the light-sensing layer at the back of the eye, and its centre — the macula — gives you the crisp detail you need to read, drive and recognise faces. Conditions such as age-related macular degeneration (AMD) and diabetic retinopathy damage this central area, so straight lines can look wavy and a blurred or blank patch can sit right where you are looking, while peripheral vision keeps working. AMD is a leading cause of vision loss in people over 50; diabetic retinopathy is a leading cause in working-age adults.
Symptoms of macular degeneration
- Blurred, dim or distorted central vision while side vision stays clear
- Straight lines — door frames, text — that look wavy or bent (called metamorphopsia)
- A blurred or blank spot in the middle of your view that hides faces and words
- Colours that look less bright, and slower adjustment between light and dark
- In diabetic retinopathy: dark floating spots, blurry patches, or a sudden shower of floaters from bleeding
What causes macular degeneration
- Age-related macular degeneration: ageing changes in the macula — 'dry' AMD (gradual thinning with drusen deposits) or 'wet' AMD (leaky abnormal blood vessels)
- Diabetic retinopathy: high blood sugar damaging the retina's tiny blood vessels over time
- Smoking, genetics and cardiovascular disease accelerate macular damage
- Other retinal conditions (retinitis pigmentosa, vein occlusions) affect the retina in their own patterns
Macular degeneration risk factors
- Age over 50 (AMD)
- Smoking — one of the strongest modifiable risks for AMD
- Family history of macular degeneration
- Diabetes, especially long-standing or poorly controlled (diabetic retinopathy)
- High blood pressure and high cholesterol
Prevention & early detection
- Don't smoke — quitting meaningfully lowers AMD risk
- Keep blood sugar, blood pressure and cholesterol well controlled, especially with diabetes
- Eat a diet rich in leafy greens and fish; for intermediate AMD, ask about AREDS2 supplements
- Have regular dilated eye exams — yearly if you have diabetes
- Check an Amsler grid at home and report any new wavy lines or central blur promptly
Treatment
Treatment depends on the condition. Wet AMD and diabetic macular edema are often treated with anti-VEGF injections that reduce leakage and can stabilise or improve vision. Diabetic retinopathy may also be treated with laser and by tight control of blood sugar and blood pressure. For intermediate dry AMD, AREDS2 vitamin formulas can slow progression. Early detection matters, because treatment works best before central vision is lost — and low-vision aids help with daily tasks if some loss remains.
When to see an eye doctor
See an eye doctor promptly for any new distortion of straight lines, a new blurred or blank spot in your central vision, or a sudden shower of new floaters or flashes — these can signal wet AMD, macular edema or another retinal problem that is most treatable when caught early. If you have diabetes, keep your scheduled dilated exams even when your vision feels fine.
Seek urgent care for:
- Sudden central vision loss or a dark/blank spot in the middle of your view
- Straight lines suddenly looking wavy or bent
- A sudden increase in floaters or flashes of light
- A curtain or shadow moving across your vision
Frequently asked questions
Does macular degeneration cause total blindness?
Rarely. AMD and most retinal conditions affect central vision while peripheral (side) vision usually remains, so people seldom lose all sight — but losing sharp central vision makes reading and recognising faces hard. Early treatment and low-vision tools help preserve independence.
What is the difference between dry and wet AMD?
Dry AMD is more common and progresses slowly as the macula thins. Wet AMD is less common but more aggressive: abnormal blood vessels leak fluid or blood, causing faster, more severe central distortion. Wet AMD is treatable with injections, so sudden distortion should be checked quickly.
Can diabetic retinopathy be prevented?
Much of it can. Keeping blood sugar, blood pressure and cholesterol in target range greatly lowers the risk and slows progression, and yearly dilated eye exams catch changes early — often before you notice any symptoms.
Why do straight lines look wavy?
Damage at the macula distorts the light-sensing layer, so the brain receives a warped image and straight lines appear bent. This is called metamorphopsia and is a classic early sign of macular disease worth reporting promptly.
Sources
- Age-Related Macular Degeneration — American Academy of Ophthalmology
- Age-Related Macular Degeneration — National Eye Institute
- Diabetic Retinopathy — American Academy of Ophthalmology