Hydroxychloroquine retinopathy and eye screening

Hydroxychloroquine is used for autoimmune conditions such as rheumatoid arthritis, lupus and certain skin conditions. It has a long safety record and benefits many people, including by reducing flares of lupus. Because it is taken for years, the small risk to the eyes becomes relevant, and rheumatology teams build eye awareness into routine care.

The retina is the light-sensitive layer at the back of the eye. In hydroxychloroquine retinopathy, the medicine accumulates in retinal tissue over time and injures the cells that detect light, usually starting in a ring around the central area. Early damage may produce no symptoms at all, because the brain compensates and the central vision is spared at first.

This is why people sometimes feel confused when told their eyes need checking despite seeing well. By the time symptoms such as blurred vision, altered colour vision or light sensitivity appear, as the NHS describes, damage may already be established, and it does not usually reverse after the medicine is stopped, though stopping may prevent further loss.

Risk rises with the length of time on the medicine, and with higher daily amounts relative to body weight. Other recognised factors include reduced kidney function, which slows clearance of the drug, taking tamoxifen, and pre-existing disease of the macula or retina. The NHS also lists maculopathy and other eye problems among reasons the medicine may be unsuitable.

These factors are why prescribers calculate the dose using body weight and revisit it if kidney function changes. Ask your rheumatology team how your dose is set and when it was last reviewed.

The NHS says that people who have taken hydroxychloroquine for a long time, or who are at higher risk, will have regular eye check-ups. The schedule is set by national and local guidance, and the NHS page does not specify intervals, so confirm timings with your rheumatology service or eye clinic.

Screening is normally done by an eye specialist or optometry-led service. The tests are painless and can include a visual acuity check, a visual field test that maps sensitivity across the centre of vision, and imaging of the retina with optical coherence tomography, sometimes with an additional photograph-based test of the retinal pigment. Eye drops may be used to enlarge the pupil, so travel arrangements matter.

• Tell the optometrist you take hydroxychloroquine and for how long.

• Bring your glasses and a list of other medicines.

• Ask for results to be shared with the rheumatologist and GP.

• Do not skip an appointment because your vision seems normal.

The NHS gives the symptoms as constant blurred vision, changes to how colours appear and sensitivity to light. It separately notes that the medicine can sometimes cause blurred vision when first started, and advises against driving, cycling or using machinery until vision has returned to normal. New or persistent visual change, particularly in someone who has taken it for years, should be reported promptly to the prescriber, GP or optometrist, and the NHS advises calling 111 for suspected serious side effects.

Sudden loss of vision, a curtain across the vision, or flashes with new floaters in one eye are separate eye emergencies and need same-day assessment at an eye casualty or A&E.

A suspected change leads to repeat testing and a joint decision between the eye specialist and the rheumatologist. Because hydroxychloroquine may be controlling a serious autoimmune disease, the decision considers the retina, the underlying condition and alternative treatments. Stopping usually prevents progression in mild early disease, which is the reason for catching it before symptoms begin. Do not stop the tablet by yourself ahead of that discussion unless advised, as a stopped medicine can trigger a flare.