Wet AMD: why might eye injections be needed more than once?

What the injection treats

This article concerns people already diagnosed with neovascular wet age-related macular degeneration (AMD). Abnormal new blood vessels can leak or bleed, damaging the macula and central vision used for reading and recognising faces.[1,2]

Anti-VEGF medicines block growth signals to limit abnormal vessel growth and leakage. They are injected into the vitreous cavity inside the eye, with an aim of preventing further visual deterioration.[2,3] This addresses a different problem from glasses and does not replace damaged macular tissue with healthy tissue in one injection.

A 2024 public clinical explanation from Zhongshan Ophthalmic Center, Sun Yat-sen University, describes this treatment and adjustment of subsequent care according to the medicine and condition.[1] It confirms clinical use in China, not identical drug availability at every hospital or one regimen for all macular diseases.

Repeat treatment does not necessarily mean failure

Treatment requires ongoing assessment, rather than judging one injection by how the eye feels afterwards. It may stabilise vision and can improve sight in some patients. There is currently no treatment that guarantees a cure for AMD.[2,4]

Seeing better after an injection and needing further treatment are related but separate questions. Doctors still need to assess stability and signs of renewed activity. Follow-up helps avoid assuming that treatment is finished simply because vision seems clearer.[2,3]

A lack of obvious visual improvement also does not by itself establish treatment failure. Preserving existing vision and limiting further damage may be important goals. Actual response should be assessed against earlier tests, rather than other patients’ injection counts.[2,3]

Why follow-up involves more than a sight test

A vision test records how well you see. Optical coherence tomography (OCT) shows retinal structure and helps the team assess changes in the lesion. Both types of information contribute to evaluating response.[2]

West Suffolk Hospital’s patient information uses vision and OCT together and adjusts subsequent care according to stability.[2] This explains the purpose of monitoring; it does not apply that hospital’s injection intervals or clinic process in China. Ask your retinal specialist about your medicine, injection number, follow-up and any treatment changes.

Injections carry risks including inflammation inside the eye, changes in eye pressure, and rare but serious infection or retinal detachment.[3] Worsening eye pain or redness, or a marked fall in vision after an injection, requires immediate contact with an eye service or local eye emergency department. Do not wait for the next appointment.[3]

Continuing care when travelling to China

If continuing treatment is needed, planning a trip around one injection is not enough. The next doctor needs the medicine used, the treated eye, injection dates and previous vision and OCT findings. Original records support comparisons; saying only how many injections you have had leaves important gaps.

Before returning home after treatment in China, ask the treating team to explain the next monitoring goals and coordinate with the receiving clinician. The return-home follow-up guide explains records and communication. This article gives no criteria for extending intervals yourself, changing medicines or stopping treatment.