Condition Library
Cataracts
Cataract is less a disease than an eventual certainty. The lens inside the eye gradually loses transparency with age, scattering light rather than focusing it cleanly.
The first symptom people notice is usually glare: halos around oncoming headlights at night, difficulty recovering after being dazzled. Colours fading is common too, though people rarely notice it until after surgery on the first eye reveals how yellow everything had become.
Symptoms
- Glare and halos around lights, particularly when driving at night
- Cloudy or hazy vision, often described as a dirty windscreen
- Colours appearing faded or yellowed
- Needing more light to read
- Frequent prescription changes
- A temporary improvement in near vision, sometimes called second sight
- Double vision in one eye
Causes and risk factors
- Age, the primary cause
- Ultraviolet exposure, which is elevated in Arizona and accelerates formation
- Diabetes, which causes cataracts to form earlier and progress faster
- Smoking
- Long-term steroid use
- Previous eye injury, inflammation or eye surgery
- Certain genetic conditions, and rarely present from birth
Treatment
- Updating your glasses prescription, which helps in early stages
- Better task lighting and anti-reflective coating, which reduce glare meaningfully
- Surgery to replace the clouded lens with an artificial implant, which is definitive
- Choosing between monofocal, toric, multifocal and extended depth of focus implants
- Post-operative care and a final prescription once healing is complete
Slowing cataract formation
- Wear sunglasses with full ultraviolet protection whenever you are outdoors. UV is an established risk factor and Arizona residents accumulate an unusual amount of it.
- Do not smoke, which accelerates cataract formation measurably.
- Control diabetes, since cataracts form earlier and progress faster with poor glucose control.
- Discuss long-term steroid use with your physician, since steroids accelerate cataract formation.
- Wear eye protection for anything that risks impact or chemical exposure, since trauma causes cataracts.
- Keep your glasses prescription current. It does not slow the cataract, and it does keep you seeing as well as the lens allows.
Common misunderstandings about cataracts
- That a cataract is a growth or a film over the eye. It is neither. It is the eye's own internal lens gradually losing transparency. Nothing is growing and nothing is peeled off during surgery: the lens is removed and replaced.
- That you should wait until it is ripe. That advice is decades out of date and comes from an era of different surgical technique. There is no benefit to waiting, and very dense cataracts are technically harder to remove. The right time is when it is interfering with your life.
- That surgery is risky or lengthy. Cataract surgery is among the most commonly performed and most successful procedures in medicine, typically taking well under half an hour with rapid visual recovery.
- That cataracts grow back. They cannot. The lens is gone. What some patients develop months or years later is clouding of the thin membrane behind the implant, which feels identical and is corrected with a painless laser procedure taking a few minutes.
How cataracts are assessed
Cataracts are graded on examination under the slit lamp, and the type matters as much as the density. Nuclear cataracts form in the centre of the lens and typically cause gradual blurring and a shift toward nearsightedness. Cortical cataracts form as spokes from the edge and are particularly associated with glare. Posterior subcapsular cataracts form at the back of the lens, progress faster, and cause disproportionate difficulty with reading and with oncoming headlights relative to how they look on examination.
That last point matters clinically. A posterior subcapsular cataract that looks modest can be causing far more functional difficulty than a denser nuclear cataract, which is why we ask what you have stopped doing rather than judging purely on appearance.
Managing before surgery, and slowing formation
Before surgery becomes worthwhile, several things genuinely help. An up-to-date prescription, since cataracts shift your refraction and an old prescription compounds the blur. Anti-reflective coating, which meaningfully reduces the night-driving glare that is usually the first real complaint. Better task lighting, positioned to illuminate the page rather than to shine toward your eyes.
For slowing formation, the modifiable factors are ultraviolet protection, not smoking, and controlling diabetes. UV protection is the one that matters most in Arizona and the one most people neglect, because they think of sunglasses as comfort rather than prevention.
When surgery does become worthwhile, the decision that deserves most thought is which lens implant you receive, because that shapes your vision for decades and it is frequently decided quickly. It is worth discussing with the doctor who knows how you actually use your eyes.
When to see an optometrist
When the cataract is interfering with things you want to do, particularly night driving or reading. There is no benefit to waiting until it is severe, and very dense cataracts are technically harder to remove. When you come, think about what you have stopped doing rather than how blurry things look. Night driving avoided, a book put down, a hobby quietly dropped: those answers tell us far more about whether surgery is worthwhile than a chart line does. It is also worth starting the conversation about lens implants well before surgery is imminent, because that decision shapes your vision for decades and is better made unhurried.
Related conditions
- GlaucomaGlaucoma is painless and takes peripheral vision first. Around half of people who have it do not know. What to watch for and how it is treated.
- Macular DegenerationAge-related macular degeneration takes central vision. What the early signs are, the difference between dry and wet, and why speed matters.
This page is general educational information, not medical advice or a diagnosis. It is not a substitute for an examination. If you are experiencing sudden vision loss, eye pain or an eye injury, contact us immediately or go to an emergency room.
Cataracts questions
When should I have cataract surgery?
When it is affecting things you want to do, rather than at any particular measurement. Difficulty driving at night, trouble reading, or having stopped an activity are the real indicators.
Can cataracts come back?
No. The lens is removed and cannot cloud again. Some people develop clouding of the membrane behind the implant, which feels similar and is corrected with a painless few-minute laser procedure.
Will I still need glasses afterward?
With a standard monofocal implant, yes for reading. With premium implants, often much less or not at all, though nothing guarantees complete independence from glasses.
Can cataracts be prevented?
Not entirely, since age is the main driver. You can slow them: full UV protection outdoors matters a great deal in Arizona, and not smoking and controlling diabetes both help.
Book an appointment with a doctor who has time for you
We schedule 2 patients an hour, so your exam is unhurried and your questions get answered. Most patients are seen within a few days.