Symptom

Peripheral vision loss

Sudden side vision loss needs prompt care

Clinically reviewed · Last reviewed 2026-06-13

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.

Glaucoma Slow, painless loss of outer vision, often unnoticed until advanced. Retinitis pigmentosa Gradual tunnel vision from inherited retinal degeneration. Retinal detachment Sudden curtain or shadow across vision, often with floaters. Optic neuritis Side vision loss with colour changes or pain on eye movement. Retinal artery occlusion Sudden, 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.