Changes in vision can be unsettling. Some eye problems develop slowly and others need care right away. This guide helps you decide what to read next and when to arrange an eye assessment.
Start with the condition that fits your concern
- Cataracts — vision that gradually becomes cloudy, faded or more affected by glare.
- Glaucoma — damage to the optic nerve that may have no early symptoms. An eye exam can detect it before you notice vision loss.
Other concerns include dry eye, conjunctivitis, age-related macular degeneration and diabetic eye disease. If a topic is not yet covered here, an eye-care professional can help assess your symptoms rather than relying on a list to identify the cause.
When to arrange an eye appointment
Book an eye assessment if blurred vision persists, your glasses no longer help you see clearly, an eye remains red or painful, or you notice a gradual change in central or side vision. Tell the clinician when the change began, whether one or both eyes are affected and whether you have diabetes, high blood pressure or a family history of eye disease. The right interval for routine dilated exams depends on your individual risk.
When to seek urgent help
- Sudden flashes, many new floaters or a dark curtain across your vision: seek urgent eye assessment. These can be signs of a retinal tear or detachment.
- Sudden severe eye pain with a red eye, blurred vision or nausea: seek emergency eye care.
- Sudden vision change with face or arm weakness or trouble speaking: call your local emergency number immediately. These can be stroke symptoms.
- Chemical splash or penetrating eye injury: get emergency help. If a chemical splashes in your eye, begin rinsing with clean water immediately while arranging help.
Protecting your vision
Wear suitable eye protection for hazardous work and sports. If you have diabetes or high blood pressure, ask your clinician how often you need a dilated eye exam. Avoid smoking and discuss any new or changing symptoms rather than waiting for the next routine check.
Sources and further reading
- National Eye Institute: Retinal Detachment
- National Eye Institute: Types of Glaucoma
- National Eye Institute: Get a Dilated Eye Exam
- National Eye Institute: Eye First Aid
- CDC: Signs and Symptoms of Stroke
Updated 28 September 2026. This information supports, but does not replace, individual medical or eye-care assessment.