Some eye symptoms require urgent attention — waiting even a few days can mean the difference between saving and losing your sight. Knowing when to act quickly and where to seek help is essential. In many cases, your local optician is the fastest and most appropriate first point of contact, as they have the specialist equipment needed to examine your eyes and can refer you directly to hospital if necessary.
Seek an urgent same-day eye assessment if you experience any of the following: a sudden increase in floaters (especially a shower of small dots or a large new floater); new flashes of light in your vision; a shadow, curtain, or dark area spreading across your field of vision (a warning sign of retinal detachment); sudden loss of vision in one or both eyes; sudden severe eye pain, especially if accompanied by a red eye, nausea, or vomiting (possible acute angle-closure glaucoma); a red, painful eye with sensitivity to light and blurred vision (possible iritis or uveitis); or a chemical splash in the eye (irrigate with clean water immediately and then seek help).
Many optician practices across the UK now offer emergency and urgent eye care services, sometimes funded through NHS commissioning arrangements such as the Minor Eye Conditions Service (MECS) or Community Optometrist Urgent Eyecare Service (CUES). These services allow you to be seen the same day or next day without a GP referral. Call your local optician first — they can triage your symptoms over the phone and advise whether you need to come in immediately, go to A&E, or can be seen the next day.
If your optician cannot see you urgently, or if you experience symptoms outside their opening hours, go to your nearest eye casualty department (sometimes called an emergency eye clinic) at a hospital. Major NHS hospitals with ophthalmology departments run dedicated eye casualty services with shorter waiting times than general A&E. You can also call NHS 111 for advice on where to go. For chemical injuries, call 999 if the substance is particularly hazardous.
It is important not to dismiss sudden eye symptoms as trivial, even if they are painless. Retinal detachment, for example, is painless but causes permanent vision loss if not treated within hours or days. Acute glaucoma can cause irreversible optic nerve damage within hours. If in doubt, always err on the side of caution and seek professional help immediately. Keeping your optician's contact number saved in your phone means you can reach them quickly when it matters most.