About this symptom
Eyesight can deteriorate gradually or suddenly, in one eye or both. Not all changes are simply due to ageing or an incorrect glasses prescription; sudden vision loss demands urgent attention.
What matters most
Gradual blurring may result from refractive error, cataract, dry eye or other conditions. Abrupt vision loss may be associated with retinal, vascular or other serious eye problems.
Symptoms and reasons to seek help
Symptoms can include blurred or double vision, poorer night vision, colour changes and difficulty reading. New flashes, a sudden shower of floaters or a dark curtain across sight are especially concerning.
How it differs from similar conditions
New glasses cannot correct every cause of blurred vision. Dry-eye symptoms, cataract and retinal disorders need different approaches, while online vision tests cannot rule out urgent disease.
Assessment and investigations
An ophthalmologist asks when symptoms began, whether one or both eyes are affected, and about pain, trauma and general medical conditions. Examination may include visual acuity and retinal assessment as indicated.
Care options and limitations
Management depends on the diagnosis: optical correction, treatment of an eye disorder or urgent specialist referral. Do not drive if you have suddenly lost vision or your sight is markedly impaired.
When emergency help is needed
Sudden loss of vision, new flashes with multiple floaters, a dark curtain, severe eye pain or a serious injury require immediate eye assessment. Do not await a routine appointment; call 103 or 112 when emergency access is needed.
Related information
Red eye; Dry eye syndrome; Cataract; Ophthalmologist consultation.
Signs and symptoms
Symptoms can include blurred or double vision, poorer night vision, colour changes and difficulty reading. New flashes, a sudden shower of floaters or a dark curtain across sight are especially concerning.
Diagnosis and tests
An ophthalmologist asks when symptoms began, whether one or both eyes are affected, and about pain, trauma and general medical conditions. Examination may include visual acuity and retinal assessment as indicated.
Care and treatment approaches
Management depends on the diagnosis: optical correction, treatment of an eye disorder or urgent specialist referral. Do not drive if you have suddenly lost vision or your sight is markedly impaired.
When to seek urgent care
Sudden loss of vision, new flashes with multiple floaters, a dark curtain, severe eye pain or a serious injury require immediate eye assessment. Do not await a routine appointment; call 103 or 112 when emergency access is needed.
Frequently asked questions
Will new glasses always solve worsening vision?
No. A clinician should first determine whether refractive error or another eye condition explains the change.
What if a dark curtain suddenly appears in my vision?
Seek emergency ophthalmology care immediately because this can be a sign of a sight-threatening condition.
Can I check eyesight adequately with an online test?
No. Online tests cannot replace an eye examination or safely exclude urgent causes of vision loss.
Information sources
Medical source links used when preparing this article.
Important information
A medical consultation is needed for diagnosis and treatment recommendations.
Self-treatment can be harmful to your health.
