Page contents
- Why do your glasses change after cataract surgery?
- Types of intraocular lens and what to expect
- Summary table: vision without glasses by lens type
- When do you get your new glasses?
- How to choose the right intraocular lens
- Small residual refractive error: what it means
- When to see an ophthalmologist
- Frequently Asked Questions about Glasses after Cataract Surgery
Whether you will need glasses after cataract surgery depends mainly on the intraocular lens chosen. With a monofocal lens set for distance, reading glasses are usually needed. With a multifocal or trifocal lens, many patients do most of their activities without glasses. The final prescription is usually given a few weeks after the operation.
Why do your glasses change after cataract surgery?
In cataract surgery, the cloudy natural lens of the eye is removed and replaced by an artificial intraocular lens, which stays in the eye permanently. The power of the lens is calculated before the operation with special measurements of the eye (biometry), so that it largely corrects any existing short-sightedness or long-sightedness.
This means that in most cases your old glasses will no longer suit you. Someone who wore thick glasses for short-sightedness for years may suddenly see clearly in the distance without them. There is, however, an important difference from the natural lens: the intraocular lens does not change shape to focus at different distances. This is why the type of lens chosen determines the distances at which you will see without glasses.
For general information on the operation, preparation and recovery, see our page on cataracts.
Types of intraocular lens and what to expect
Monofocal lens
This is the most common type and gives very good quality vision at one distance. It is usually set for distance: driving, television, walking. Glasses are needed for reading and often for the computer, as for anyone with presbyopia. Some short-sighted people prefer a near target, so that they can read without glasses and wear glasses for distance.
One variation is monovision: one eye is set for distance and the other for closer up. It reduces the need for glasses, but it does not suit everyone, and it is often tried first with contact lenses.
Multifocal and trifocal lenses
These lenses split light into several focal points, so that the eye can see at distance, intermediate and near. Most patients carry out their daily activities without glasses. The trade-off is that bright rings (halos) may appear around lights at night, with a slight reduction in contrast. The brain usually adapts within a few months. For very small print or in low light, some people need glasses occasionally.
Extended depth of focus (EDOF) lens
EDOF lenses create a continuous range of clear vision from distance to intermediate, meaning a computer screen, a car dashboard or the kitchen. For very close tasks, such as reading small print, light reading glasses are often needed. Night-time light effects are usually milder than with multifocal lenses. You can find out more about the options on our page about lenses for presbyopia.
Toric lens
A toric lens corrects astigmatism of the cornea. It is not a separate focusing category: it is available as a monofocal, multifocal or EDOF toric lens. If there is significant astigmatism and a standard lens is implanted, glasses will usually be needed for distance as well. With a toric lens this need is greatly reduced. For a toric lens, accurate measurement of astigmatism before the operation and correct alignment inside the eye are particularly important, because how well it is corrected depends on them.
Summary table: vision without glasses by lens type
These are general guidelines. The result in each person depends on the health of the eye, astigmatism, the macula and how the brain adapts.
| Intraocular lens | Distance | Intermediate | Near |
|---|---|---|---|
| Monofocal (distance target) | Usually clear | Glasses often needed | Glasses usually needed |
| Multifocal or trifocal | Usually clear | Usually clear | Usually clear, perhaps glasses for small print or low light |
| EDOF | Usually clear | Usually clear | Light reading glasses often needed |
| Toric (corrects astigmatism) | Usually clear, without glasses for astigmatism | Depends on whether it is monofocal, multifocal or EDOF | Depends on whether it is monofocal, multifocal or EDOF |
When do you get your new glasses?
In the first few days after the operation, vision improves gradually as the swelling and inflammation settle. The refraction of the eye usually stabilises within 4 to 6 weeks. That is when the measurement for the new prescription is taken, once the ophthalmologist has confirmed that healing is progressing normally. If the second eye is also going to be operated on, the final prescription often waits until that eye has recovered too.
The interval between the two eyes
The period between the two operations can be uncomfortable, because the operated eye sees differently from the other one. Some practical solutions:
- ask your optician to remove the lens from your old glasses on the side of the operated eye,
- simple ready-made reading glasses for the time being,
- a contact lens in the eye that has not yet been operated on, if you already tolerated one.
All these options are temporary and it is best to discuss them with your surgeon. You will find practical advice for before and after the operation in our article on what you need to know about cataract surgery.
How to choose the right intraocular lens
There is no single lens that is ideal for everyone. In the discussion before the operation, it is worth thinking about:
- How much does wearing glasses bother you, and for which activities?
- Do you often drive at night?
- Do you work for many hours at a computer or do fine close-up work?
- Are there other eye problems, such as macular conditions or glaucoma, that might make a multifocal lens less suitable?
The pre-operative assessment includes measurements of the cornea, astigmatism and the macula, so that the recommendation is based on objective data. The cost depends on the type of lens and the tests needed, and you are given full details after the examination.
Small residual refractive error: what it means
Despite precise calculations, the final result may differ slightly from the target, mainly in eyes with very high short-sightedness, long-sightedness or previous laser refractive surgery. A small residual error is usually corrected with glasses. In selected cases there are other options, which are discussed once the eye has stabilised.
When to see an ophthalmologist
After the operation, follow the schedule of check-ups you have been given. However, contact us immediately if you experience:
- pain that is getting worse instead of easing,
- a sudden drop in vision,
- marked redness or swelling,
- flashes, many new floaters or a shadow over part of your field of vision.
If your vision gradually becomes cloudy again months or years after the operation, the cause is often posterior capsule opacification, which is treated in the clinic with YAG laser. It is not the cataract coming back, and it is not solved by changing glasses.
To discuss which intraocular lens suits your needs, book an appointment at our clinic in Neo Psychiko, Athens.
Frequently Asked Questions about Glasses after Cataract Surgery
Can I wear my old glasses after the operation?
Usually not, because the intraocular lens changes the refraction of the eye and the lens of your old glasses on the side of the operated eye is now wrong. Often your optician can temporarily remove that lens. For reading, simple ready-made reading glasses help until the final prescription is given.
Do I need sunglasses after cataract surgery?
In the first few weeks the eye is more sensitive to light, so sunglasses help with comfort and protect against dust and wind. Modern intraocular lenses filter ultraviolet light, but good sunglasses with certified UV protection are still useful, including for the eyelids and the skin around the eyes.
Is a multifocal lens suitable for everyone?
No. In eyes with macular conditions, advanced glaucoma, significant dry eye or corneal irregularities, the quality of vision with a multifocal lens may be reduced. In addition, people who drive a lot at night or have high demands for contrast may prefer another solution. The decision is made after a full pre-operative assessment.
Why does vision become cloudy again years after the operation?
The most common cause is posterior capsule opacification, a clouding of the thin membrane behind the intraocular lens. It is not the cataract coming back. It is treated in the clinic with YAG laser, a short procedure without any incision, and vision usually improves quickly. Changing glasses does not help in this case.
Questions about your case?
Dr. Skouteris will examine you at his practice in Neo Psychiko and explain your options.
Ophthalmic surgeon trained at the John Radcliffe University Hospital in Oxford and Fellow of the European Board of Ophthalmology (FEBO).
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