This site provides general eye-health education. It cannot replace individual assessment by a registered doctor, and does not offer personal diagnosis, prescriptions, bookings, sales or referrals.

If translations differ or are incomplete, the Traditional Chinese (zh-Hant) text on this site prevails.

Hong Kong public eye education

Site last reviewed: 6 October 2026 · Dr Poon Ka KinSite version：1.85

Common eye conditions and fact sheets

Learn symptoms and when to seek care, grouped by anatomy.

Display options

Type

Appearance

Layout

Add to Home Screen

Emergency · go to A&ESudden vision loss, a curtain, severe pain with vomiting, penetrating injury or chemical splash: go to A&E now. If you cannot get there: call 999. For chemicals, irrigate first with plenty of water. For penetrating injury / ruptured globe: do not press or self-irrigate (see urgent page).Sudden vision loss, a curtain, or sudden blindness: do not drive yourself to A&E — arrange a lift or call 999.If you cannot get there: call 999

Tools

Amsler gridCover one eye · centre Lens vision demoFar vs near IOL 3D optics studioSee how rays focus in 3D Eye mapTap the diagram Drop techniqueFollow the steps Questions for your doctorAsk before you decide

All education tools

By anatomy

Open the full eye-map tool

Lens and refractionMyopia, hyperopia · cataract · squint

Eyelids and tear filmDry eye · blepharitis · entropion · watering

Glaucoma and optic nerveEye pressure · optic-nerve scan (OCT) · visual field

Retina and maculaMacular degeneration · diabetic eye disease · detachment

Cornea and ocular surfaceConjunctivitis · allergy · laser for corneal surface (PTK)

MaculaAMD · macular hole · ERM

Ten common eye conditions

01Refractive errorMyopia · hyperopia · astigmatism · presbyopiaCommon in Hong Kong 02Dry eyeGritty dryness · do not dismiss severe cases as “just dry eye”Very common 03CataractGradual blur and glare · discuss surgery with an ophthalmologist when daily life is affectedAge-related 04GlaucomaOpen-angle · normal-tension · ocular hypertension · angle-closure attackLost nerve fibres and field do not return 05Age-related macular degenerationBent lines or a central dark patch: same-day ophthalmic assessmentCentral vision 06Diabetic retinopathyOften silent early · needs regular dilated fundus examsNeeds regular checks 07ConjunctivitisRed itchy eye · do not self-buy steroids for heavier allergy; needs a doctor's assessmentRed eye 08Floaters and retinal detachment riskNew flashes or more floaters: same-day dilated assessmentDo not ignore flashes 09Blepharitis, stye and chalazionRed lid lumps · do not squeeze yourselfEyelid problems 10PterygiumA triangular growth on the white · protect from UVSun and wind

Law and professional code Privacy and on-device data Accessibility statement Further reading

Publisher / operator: 護眼學堂 (eyesinfo.org). Clinical review: Dr Poon Ka Kin (registered doctor, Medical Council of Hong Kong; Specialist Register (Ophthalmology)). This education site does not provide clinic contact, booking or referral, and does not link to a practice website. This education site currently has no commercial sponsorship; if funding or conflicts of interest arise later, they will be disclosed on the legal page. Education content is shown separately from any clinic promotion; the reviewer may also practise clinically — this site does not refer.

This content cannot replace an in-person consultation with a registered ophthalmologist and is not a diagnosis. This page is not diagnostic, prescribing or surgical advice. Only doctors listed on the Medical Council specialist register in ophthalmology may use the title “ophthalmologist” (眼科專科醫生).

Law and professional code