When Should You Have Cataract Surgery? Timing, Night-Driving Glare and the Risks of Waiting

Hello. I’m Dr. Jinhag Baik, an ophthalmologist and head director of nuneHIM Eye Center on Siheung-daero in Guro-gu, Seoul.

Many people, in Korea and elsewhere, have heard that a cataract should be left to “ripen” before it’s removed. As the evenings get darker in November, I also hear from people whose drive home suddenly feels harder, with oncoming headlights smearing into halos.

The short answer: the right time for cataract surgery isn’t decided by how advanced the cataract looks. It’s decided by how much your vision is getting in the way of daily life. If glasses still work well for you, there’s no rush. If you’re struggling, there’s no reason to wait for the cataract to “ripen.”

What the guidelines actually say

The American Academy of Ophthalmology’s Cataract in the Adult Eye Preferred Practice Pattern (2021) gives the main reason for surgery as a decline in visual function that no longer meets your needs, where surgery is reasonably likely to help. Other reasons include a large difference in prescription between your two eyes, a cataract that blocks the view or treatment of the retina, and lens-related inflammation or glaucoma.

The same guideline also says when surgery should not be done:

Timing, it says, should be “mutually agreeable between the patient and surgeon.” There’s no fixed date on the calendar.

Why “20/30 on the chart” can still mean real trouble

The guideline is clear that no single test defines when to operate, and that the decision should not be based on eye-chart acuity alone. Reading high-contrast black letters in a dim exam room underestimates the problems people have in real life.

Glare is the classic example. Some people with cataract see almost normally in a dark exam room, but their acuity or contrast sensitivity drops sharply when a bright light, such as oncoming headlights, is added. Glare isn’t unique to cataract, though: dry eye and other ocular surface problems can cause it too, so the lens has to be examined directly.

Things worth telling your eye doctor, whatever your chart result:

• Halos or starbursts around headlights at night
• Washed-out vision in bright sunlight
• Slower reading, or needing more light to read
• Double or ghost images in one eye
• Trouble judging steps and curbs

What the evidence shows after surgery

Driving. In a 2002 study in JAMA, 277 people with cataract aged 55 to 84 were followed for 4 to 6 years. Those who chose surgery had about half the rate of police-reported crashes of those who didn’t (rate ratio 0.47). Patients chose for themselves, so this isn’t a randomized trial. Large Western Australian datasets found crash reductions after surgery ranging from 12.7% (27,827 first-eye patients, 2012) to 61% after the first eye in drivers who later had both eyes done (2,849 drivers, 2019). The size varies by study; the direction is consistent.

Falls. A 2005 randomized trial in the UK assigned 306 women over 70 to first-eye surgery within about 4 weeks or a routine wait of about 12 months.

Note what this does not show: about as many people fell at least once in both groups. What dropped was repeated falling. The trial included only older women.

Hip fractures. Among 1.1 million U.S. Medicare beneficiaries with cataract, surgery was linked to lower odds of hip fracture within a year (adjusted odds ratio 0.84). The absolute difference, though, was 0.20%, roughly 2 in 1,000 people, and the data were observational.

Dementia? A 2022 cohort of 3,038 older adults found lower dementia risk after cataract surgery (hazard ratio 0.71). It’s an association, not proof, and not a reason to have surgery.

What happens if you wait too long?

• A 2007 systematic review of 27 studies found that people who waited more than 6 months had more vision loss, worse quality of life, and more falls than those who waited 6 weeks or less. Waits between 6 weeks and 6 months were unclear.
• In 55,567 UK cataract operations, posterior capsule rupture or vitreous loss occurred in 1.92%. Risk indicators included brunescent (hard, brown) or white cataracts, along with older age, glaucoma, diabetic retinopathy, a small pupil, a long eye, and the alpha-blocker doxazosin. Waiting for a cataract to “ripen” moves you toward the harder, riskier end.
• Rarely, a swollen or leaking lens can trigger glaucoma or inflammation.

Can eye drops or vitamins slow a cataract?

Not according to current evidence. The AAO guideline states that no medication is known to eliminate an existing cataract or slow its progression. A 2012 Cochrane review of 9 randomized trials (117,272 people) found no benefit from high-dose beta-carotene, vitamin C, or vitamin E. What does help in the meantime: updating your glasses for early prescription changes, low-vision aids, not smoking, and UV-B-blocking sunglasses with a brimmed hat.

Risks of surgery, honestly

Tell your surgeon about all medications, especially alpha-blockers for the prostate and long-term steroid inhalers, pills or drops, and about any previous LASIK or LASEK, which changes how lens power is calculated.

How we assess timing at nuneHIM Eye Center

A cataract evaluation here includes corrected vision and refraction, a slit-lamp exam of the lens, a dilated retina exam, macular OCT when vision is worse than the cataract would explain, eye pressure, and tear film and ocular surface checks. If surgery is chosen, biometry is used to calculate lens power. Just as important is a conversation about when, exactly, your vision lets you down.

If you commute by car to Guro Digital Complex or Gasan Digital Complex, pay attention to night-driving glare this winter, and mention it at your exam even if your chart result looks fine.

Bottom line

The right time for cataract surgery is not when the cataract is “ripe.” It’s when blurred vision starts limiting your life. If glasses still serve you well, regular checkups are enough; if they don’t, there’s no benefit in waiting.

nuneHIM Eye Center | Dr. Jinhag Baik, Ophthalmologist 5F Kwanghee Bldg, 551 Siheung-daero, Guro-gu, Seoul (near Guro Digital Complex and Gasan Digital Complex stations) http://www.nunehim.com | Naver booking: https://booking.naver.com/booking/13/bizes/923695

This article is for general medical information as of November 2026. It is not a recommendation for any specific procedure, and whether and when to have surgery depends on an individual examination by an ophthalmologist.

References

1. Miller KM, et al. Cataract in the Adult Eye Preferred Practice Pattern. Ophthalmology. 2022;129:P1–P126. https://pubmed.ncbi.nlm.nih.gov/34780842/
2. Owsley C, et al. Impact of cataract surgery on motor vehicle crash involvement by older adults. JAMA. 2002;288:841–9. https://pubmed.ncbi.nlm.nih.gov/12186601/
3. Meuleners LB, et al. The effectiveness of cataract surgery in reducing motor vehicle crashes. Ophthalmic Epidemiol. 2012;19:23–8. https://pubmed.ncbi.nlm.nih.gov/22273356/
4. Meuleners LB, et al. The impact of first- and second-eye cataract surgery on motor vehicle crashes and associated costs. Age Ageing. 2019;48:128–33. https://pubmed.ncbi.nlm.nih.gov/30265273/
5. Harwood RH, et al. Falls and health status in elderly women following first eye cataract surgery: a randomised controlled trial. Br J Ophthalmol. 2005;89:53–9. https://pubmed.ncbi.nlm.nih.gov/15615747/
6. Tseng VL, et al. Risk of fractures following cataract surgery in Medicare beneficiaries. JAMA. 2012;308:493–501. https://pubmed.ncbi.nlm.nih.gov/22851116/
7. Lee CS, et al. Association between cataract extraction and development of dementia. JAMA Intern Med. 2022;182:134–41. https://pubmed.ncbi.nlm.nih.gov/34870676/
8. Hodge W, et al. The consequences of waiting for cataract surgery: a systematic review. CMAJ. 2007;176:1285–90. https://pubmed.ncbi.nlm.nih.gov/17452662/
9. Narendran N, et al. The Cataract National Dataset electronic multicentre audit of 55,567 operations. Eye. 2009;23:31–7. https://pubmed.ncbi.nlm.nih.gov/18327164/
10. Pershing S, et al. Endophthalmitis after cataract surgery in the United States, 2013–2017. Ophthalmology. 2020;127:151–8. https://pubmed.ncbi.nlm.nih.gov/31611015/
11. Mathew MC, et al. Antioxidant vitamin supplementation for preventing and slowing the progression of age-related cataract. Cochrane Database Syst Rev. 2012;CD004567. https://pubmed.ncbi.nlm.nih.gov/22696344/