What does Best disease look like?

The scene almost unchanged, with the faintest softening at the center.

The scene with the center bent and wavy; the path edges and lamp post are distorted while the edges are sharp.

The scene with a wider blurred, distorted center.

Wavy lines, a smudge in the middle and good side vision. In the words of people who live with it, with the frames from our simulator and the sources behind every statement.

Medically reviewed by Stephen Johnston, MD. Reviewed 2026-10-23.

The short answer

For many years a child with Best disease may see almost normally. When changes come, they come in the center: a small smudge or blurred area where she is looking, straight lines that bend or have a bump in them, or a gap in a word. One eye is often worse than the other, so she may not notice until the better eye is covered. Side vision stays normal, so getting around is not the problem; reading small print and recognizing faces are. A sudden new distortion is a reason to be seen urgently.

What the person is experiencing

Best disease is an inherited condition of the macula, the center of the retina. Usually the first problems people notice are with seeing detail: reading small print becomes harder, and "it may seem that there's a slight smudge or a small, blurred area in the centre of your vision". Straight lines may look distorted or wavy, or as if there is a little bump in them; the patient charities describe lamp posts and door frames appearing curvy, and gaps in objects, lines or words. People may notice these changes in one eye only.

Side vision is not usually affected, and because we use side vision for moving around, most people with Best disease continue to get about on their own. The RNIB gives a neat example: a person may get to the bus stop and see the bus coming, but find it hard to read the number on it. Some people are sensitive to light. Sharpness may remain normal or near normal for many years, and many people keep useful central vision in at least one eye of about 20/50 in the less-affected eye. Vision tends to decline gradually but does not reach complete sight loss.

Why she may not know anything is wrong

Doctors often diagnose Best disease in a child who has no symptoms, typically between the ages of 3 and 15, because the yellow "egg-yolk" spot at the macula is visible during an eye examination before it affects vision. Vision is usually little affected in the early stages; changes are more often noticed at the later stages when the lesion breaks up or scars. And as with other central blind spots, when a blank patch does appear it is filled in with the surrounding color rather than seen as black, so it is easy to miss. Because the eyes are often affected unequally, the better eye covers for the worse one.

In their words

We did not find published first-person accounts of Best disease that describe the percept in detail, so this section draws on the low-vision and charity descriptions. The IALVS describes "a blurry area or a smudge in the center of your visual field, making it hard to see detail", straight lines that "become wavy or seem to have a bump in the middle", and, in later stages, a blind spot in central vision; it notes that "seeing a person, but not recognizing their face or facial expression, is irritating, if not distressing". Many people mention problems reading small print.

What our simulation shows

The blank is filled in rather than black for the reason above.

Early: The early egg-yolk stage: nearly normal vision with slight waviness at the very center.

Mid: The atrophic stage, with a distorted, blurred center and a small filled-in blank patch.

Late: The sudden distortion and larger central blank of the blood-vessel stage.

Signs you might notice in a child

Complaints that letters or lines look bent, or that a word has a piece missing.

Covering one eye, or saying one eye is "better".

Holding books close, trouble with small print, and discomfort in bright light.

Not recognizing people from a distance while moving around with complete confidence.

Common questions

Why was she diagnosed if she sees fine?

Because the macular changes are visible to the eye doctor before they affect vision, and the condition runs in families.

What is the emergency?

Abnormal blood vessels can grow under the retina and bleed or leak suddenly, causing acute loss of vision. Everyone with Best disease should check each eye separately several times a week and see their retinal specialist urgently if one eye suddenly gets worse. New wavy lines or a new blank patch count as sudden change.

What helps right now?

Good lighting and magnification for small print, large text on screens, sunglasses if light is uncomfortable, and the eye-by-eye self check. Because the condition is dominant, parents and siblings may wish to be examined.

References

Sources were read on Oct 22-23, 2026.

1. MedlinePlus Genetics, U.S. National Library of Medicine. Vitelliform macular dystrophy. https://medlineplus.gov/genetics/condition/vitelliform-macular-dystrophy/

2. Royal National Institute of Blind People (RNIB). Best disease (Best vitelliform macular dystrophy). https://www.rnib.org.uk/your-eyes/eye-conditions-az/best-disease-best-vitelliform-macular-dystrophy/

3. Retina UK. Best disease. https://retinauk.org.uk/information-and-support/about-inherited-sight-loss/types-of-inherited-sight-loss/best-disease/

4. Gene Vision (UK). Best disease: for patients. https://gene.vision/knowledge-base/best-disease-for-patients/

5. International Academy of Low Vision Specialists. Living With Best Disease. https://ialvs.com/ways-we-can-help/what-is-a-low-vision-exam/low-vision-eye-diseases/living-with-best-disease/

6. UCL Institute of Ophthalmology, Carr Lab. What are bestrophinopathies: Best disease. https://www.ucl.ac.uk/brain-sciences/ioo/research/research-labs-and-groups/carr-lab/what-are-bestrophinopathies/best-disease

7. Pratt JD, Stevenson SB, Bedell HE. Scotoma visibility and reading rate with bilateral central scotomas. Optom Vis Sci. 2017;94(3):279-289. doi:10.1097/OPX.0000000000001042 https://pmc.ncbi.nlm.nih.gov/articles/PMC5321850/

8. A Race Against Blindness. How our vision simulations were built: research basis and rendering conventions (Education Hub, Oct 2026). https://araceagainstblindness.org/education/vision-simulations/methodology

9. Raising Children Network (Australia). Low vision and blindness: babies, children and teenagers. https://raisingchildren.net.au/disability/guide-to-disabilities/assessment-diagnosis/low-vision-blindness-babies-children-teens