---
title: What causes a curtain or shadow in vision?
description: "A curtain or shadow across vision is a red-flag symptom and may indicate retinal detachment or stroke-like problems. ## Retinal causes of a curtain When the retina pulls away from the back of the eye, part of the visual field…"
url: "https://bluefinvision.com/knowledge-base/topics/symptoms-signs/what-causes-a-curtain-or-shadow-in-vision/"
updated: "2025-12-31"
category: "Symptoms & Signs"
---

# What causes a curtain or shadow in vision?

A curtain or shadow across vision is a red-flag symptom and may indicate retinal detachment or stroke-like problems.

## Retinal causes of a curtain

When the retina pulls away from the back of the eye, part of the visual field can disappear. The shadow is usually painless but progresses over hours or days.

- Retinal detachment often follows new floaters and flashing lights
- Bleeding inside the eye can also cause dark patches
- Tears or holes in the retina may create a creeping shadow
- Short-sighted people and those after eye surgery are at higher risk

## Other serious possibilities

Sudden visual field loss can also result from blocked blood vessels or brain events. These situations require emergency care.

- Stroke affecting the visual pathways may cause side vision loss
- Eye strokes occlusions reduce blood flow to the retina
- Immediate hospital assessment improves chances of saving sight
- Do not drive; seek urgent medical help straight away