Symptom

Peripheral vision loss

Sudden side vision loss needs prompt care

Medical reviewer Mr Mohamed Mohyudin· Last recorded site review

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When to get urgent help

  • Sudden loss of side vision in one eye, especially with floaters or flashes
  • A dark curtain or shadow spreading across your vision
  • New peripheral loss with eye pain or a very red eye
  • Peripheral loss with weakness, numbness or slurred speech

Common causes

Side vision can narrow for several reasons. These are common causes linked to conditions you can read about next.

GlaucomaSlow, painless loss of outer vision, often unnoticed until advanced.Retinitis pigmentosaGradual tunnel vision from inherited retinal degeneration.Retinal detachmentSudden curtain or shadow across vision, often with floaters.Optic neuritisSide vision loss with colour changes or pain on eye movement.Retinal artery occlusionSudden, painless severe vision loss from a blocked artery.

What can help

  • Book an eye test if side vision feels reduced, especially when bumping into door frames
  • Treat sudden curtain-like loss or new floaters as urgent
  • Attend regular eye checks if you have glaucoma risk factors or a family history

Frequently asked questions

What does peripheral vision loss feel like?

You may notice bumping into things at the sides, difficulty driving at junctions, or feeling as if you are looking through a tunnel. Central vision may still seem clear in early glaucoma.

Is peripheral vision loss always glaucoma?

No. Glaucoma is a common gradual cause, but retinitis pigmentosa, retinal detachment, stroke and other conditions can also affect side vision. Assessment is needed to find the cause.

Can lost peripheral vision be restored?

It depends on the cause and how early it is found. Glaucoma damage cannot be reversed but treatment can slow further loss. Some acute causes need urgent treatment to save sight.

Your next step

Take this to your appointment

Write down what has changed, when it started, your current medicines and the questions you want answered. Take these to your eye-care appointment.

Patient resourcesFind care where you live →

Sudden loss of sight, severe eye pain or a dark curtain across vision needs immediate assessment. Do not wait to complete a worksheet.

Trusted sources

For general background, these organisations provide eye-health information. This list is further reading, not a record that they reviewed this article.