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At a glance
- A cataract is a clouding of the eye’s normally clear lens, causing gradual blurring, dimming or yellowing of vision.
- It is extremely common with age and is the leading cause of reversible blindness worldwide.
- There are no eye drops or medications that reverse a cataract — the only effective treatment is cataract surgery, which replaces the cloudy lens with a clear artificial one.
- Surgery is one of the most common and successful operations performed in Singapore, and is claimable under MediSave with subsidies available at public hospitals.
What a cataract is and how it develops
Inside the eye, a clear lens sits behind the pupil and focuses light onto the retina. Over time, proteins in the lens break down and clump together, making the lens progressively cloudy. Because the change is slow, many people do not notice it at first — colours may look faded, lights can seem to have a halo or glare, and vision becomes hazy as though looking through a foggy window. Reading, night driving and recognising faces often become harder.
Types of cataract
- Age-related cataract — by far the most common, developing gradually from the 50s and 60s onwards.
- Congenital cataract — present at birth or in early childhood, sometimes linked to infection during pregnancy or inherited conditions.
- Traumatic cataract — following a blunt or penetrating eye injury.
- Secondary cataract — associated with other conditions such as diabetes, long-term steroid use, or previous eye surgery.
Who is at higher risk
Risk rises with age, but is increased by diabetes, smoking, prolonged exposure to ultraviolet sunlight, long-term corticosteroid use, previous eye injury or surgery, and a family history of cataracts. In Singapore’s sunny climate, ultraviolet protection with sunglasses is a simple preventive measure.
How cataracts are detected
A cataract is diagnosed during a routine eye examination. An optometrist or eye specialist (ophthalmologist) will check your visual acuity and use a slit-lamp microscope to view the lens directly. Because symptoms overlap with other eye conditions such as glaucoma and macular degeneration, a full assessment helps confirm that the cataract is the cause of your blurring.
Treatment
Early cataracts that cause little disturbance can simply be monitored, and a change of glasses may help for a time. When the cataract begins to interfere with daily activities — driving, reading, work or hobbies — surgery is recommended. Modern cataract surgery removes the cloudy lens through a small incision (phacoemulsification) and replaces it with a clear intraocular lens implant, usually as a day procedure under local anaesthesia. Most people notice clearer vision within days. See our dedicated cataract-surgery guide for what the procedure involves, lens options and costs.
When to see a doctor
Book an eye assessment if your vision has become blurred, dim or increasingly difficult at night, if glare from headlights or sunlight is bothersome, or if you are updating your glasses more often than usual. Sudden vision loss, eye pain or flashes and floaters are not typical of a cataract and should be assessed promptly, as they can signal a more urgent problem.
Common questions
Can a cataract be treated without surgery?
No. There are currently no eye drops, medicines or exercises proven to clear a cataract. Surgery is the only effective treatment, though it can often be safely deferred until the cataract affects your daily life.
Is cataract surgery claimable under MediSave?
Yes. Cataract surgery is claimable under MediSave up to set limits, and subsidised rates are available at public hospitals for eligible patients. Your surgeon or the clinic can give you an estimate based on the lens and setting chosen.
Will a cataract come back after surgery?
The cataract itself cannot return, as the natural lens has been removed. Some people later develop clouding of the membrane behind the lens implant (posterior capsule opacification), which is easily treated with a quick, painless laser procedure in clinic.
Cataract surgery: cost and MediSave in Singapore
Cataract surgery is one of the most common operations performed in Singapore and is claimable under MediSave up to set limits per eye. At public hospitals, subsidised rates are available for eligible Singaporeans and permanent residents, while private centres charge more but often offer shorter waiting times and a wider choice of lens. The final cost depends mainly on the type of intraocular lens chosen and the setting. It is worth asking the clinic for an itemised estimate, including the lens, facility and surgeon fees, and checking what your Integrated Shield Plan covers, as this varies by plan and ward or clinic class.
Choosing a lens implant
When the cloudy lens is removed, it is replaced with a clear artificial lens, and the choice affects your vision afterwards. A monofocal lens gives clear vision at one distance (usually far), with glasses for reading — it is reliable and fully claimable at subsidised rates. A toric lens corrects astigmatism, and multifocal or extended-depth-of-focus lenses aim to reduce dependence on glasses at multiple distances, though they cost more and can cause more glare or halos at night. Your surgeon will recommend a lens based on your eyes, lifestyle and budget.
Related conditions & guides
Sources
- Singapore National Eye Centre — patient information on cataract.
- HealthHub Singapore — cataract overview.
- World Health Organization — blindness and vision impairment.
This article is for general information only and does not replace a consultation with a qualified eye-care professional. Please seek personalised advice for your own eyes.