Key Takeaways
- Cataract surgery can reduce night vision problems when cataracts are the main cause of glare, halos, blurred vision, or difficulty seeing in low-light conditions.
- Cataracts can scatter light inside the eye, making headlights and streetlights appear brighter and creating glare or halos at night.
- Although vision often improves after treatment, some people may continue to experience night vision difficulties because of other eye conditions or the type of artificial lens implanted.
- A comprehensive eye examination can determine whether cataracts are responsible for your night vision problems and whether surgery is likely to help.
Cataracts are a common age-related eye condition in which the normally clear lens inside the eye becomes cloudy. As the cataract develops, it can cause blurry or hazy vision, faded colours, sensitivity to light, glare, halos around lights, and difficulty seeing at night [1]. These symptoms can interfere with activities such as driving after dark or navigating poorly lit areas.
For people whose night vision problems are primarily caused by cataracts, cataract surgery can significantly improve vision in low-light conditions [2]. The procedure removes the cloudy natural lens and replaces it with a clear artificial intraocular lens, or IOL. However, the degree of improvement depends on the health of the rest of the eye and the cause of the night vision problem.
Why Do Cataracts Affect Night Vision?
The natural lens should allow light to pass through the eye and focus clearly on the retina. When a cataract makes the lens cloudy, light can scatter rather than forming a sharp image on the retina.
This scattering can become particularly noticeable at night. For example, headlights from approaching vehicles may appear unusually bright, while streetlights may have halos or starburst-like effects around them. Reduced contrast can also make it harder to distinguish objects against a dark background.
The type and location of a cataract can influence the symptoms. Some cataracts are particularly associated with glare and difficulty seeing in dim environments, meaning patients may notice problems with night driving before they experience major daytime vision changes.
How Can Cataract Surgery Improve Night Vision?
During cataract surgery, the cloudy natural lens is removed and replaced with an artificial intraocular lens. Because the artificial lens is clear, it does not have the cloudiness that caused light scattering from the cataract.
As a result, patients may experience clearer vision, improved brightness and colour perception, and less difficulty performing activities in low-light conditions. The National Eye Institute reports that about 9 out of 10 people who undergo the procedure see better afterward [3].
For someone whose night vision difficulties are caused primarily by a cataract, removing that cloudy lens can therefore address an important source of glare and reduced visual clarity.
However, improvement is not guaranteed to eliminate every night vision complaint. Other conditions affecting the eye can continue to affect vision even after the cataract has been removed.
What Night Vision Problems May Improve?
| Night vision problem | Can cataract removal help? |
| Blurred vision at night | Often, if caused by the cataract |
| Glare from headlights | May improve when the cataract is responsible |
| Halos around lights | May improve, depending on the cause |
| Reduced contrast | Often improves, although other eye conditions may contribute |
| Difficulty seeing in dim environments | May improve if the cataract is the main cause |
| Night vision problems from retinal disease | May persist and require separate management |
The important distinction is that cataract surgery treats vision problems caused by the cloudy lens. It does not correct every condition that can affect night vision.
Can Night Vision Be Worse After Surgery?
Although the goal is to improve vision, some people experience glare, halos, or other visual phenomena after surgery. These effects can be associated with the characteristics of the artificial lens, particularly certain multifocal or extended-depth-of-focus lenses. Some premium IOL designs can provide a wider range of vision but may also be associated with glare, halos, or reduced contrast sensitivity in some patients [4].
This is why choosing the appropriate IOL is an important part of the treatment process. Your ophthalmologist will consider your vision requirements, lifestyle, eye health, and expectations when discussing lens options.
If night driving is particularly important to you, tell your ophthalmologist before the procedure. This information can help guide the discussion about which lens may be most appropriate for your visual needs.
What If Night Vision Problems Continue?
Persistent night vision difficulties after cataract surgery do not necessarily mean that the procedure was unsuccessful. Several other factors can affect vision in low-light conditions.
For example, residual refractive error, dry eye, corneal conditions, retinal disorders, glaucoma, or other eye problems may contribute to visual difficulties. The type of IOL can also influence how a person perceives glare and halos.
Another possible cause is posterior capsule opacification, sometimes called a secondary cataract. This occurs when the capsule behind the artificial lens becomes cloudy after surgery. It can cause blurred vision, glare, halos, and reduced contrast. When clinically significant, it can generally be treated with a laser procedure [5].
A follow-up examination can help identify the underlying reason for persistent symptoms.
When Should You Consider Cataract Surgery?
Not everyone with a cataract needs immediate treatment. Early cataracts may cause few symptoms and may not interfere significantly with everyday activities.
Doctors generally consider cataract operation when vision changes begin affecting activities such as reading, working, watching television, or driving. Night driving difficulties can therefore be an important consideration when discussing whether treatment is appropriate [6].
Rather than relying only on a visual acuity chart, your ophthalmologist will consider how your vision affects your daily life. Someone may have a reasonably good daytime visual acuity but still experience significant glare or difficulty seeing at night.
How Can You Prepare for Better Night Vision?
Before treatment, tell your ophthalmologist specifically what you experience at night. Describe whether you have glare from headlights, halos around streetlights, blurred vision, difficulty distinguishing objects, or trouble driving in low-light conditions.
Your doctor can assess the cataract and examine other structures of the eye to determine whether the cataract is likely to be responsible for your symptoms. This evaluation is important because conditions affecting the retina, optic nerve, or cornea may also influence night vision.
It is also important to follow postoperative cataract surgery instructions and attend scheduled follow-up appointments. Vision can be blurry immediately after the procedure while the eye heals, and your prescription may change as your vision stabilises.
Conclusion
Cataract eye surgery can reduce night vision problems when a cloudy cataract is responsible for symptoms such as glare, halos, blurred vision, and difficulty seeing in dim conditions. Replacing the cloudy natural lens with a clear artificial lens can improve the amount and quality of light reaching the retina.
However, the procedure does not guarantee perfect night vision. Other eye conditions, residual refractive errors, or the characteristics of the implanted lens can continue to affect vision after treatment.
If cataracts are making it difficult to drive at night or causing bothersome glare around headlights and streetlights, an ophthalmological assessment can help determine whether cataract removal surgery is appropriate and what visual improvement you may reasonably expect.
References
- National Eye Institute. (2025). Cataracts. National Institutes of Health. https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/cataracts
- Subzwari, S., Desapriya, E., Scime, G., Babul, S., Jivani, K., & Pike, I. (2008). Effectiveness of cataract surgery in reducing driving-related difficulties: A systematic review and meta-analysis. Injury Prevention, 14(5), 324–328. https://doi.org/10.1136/ip.2007.017830
- National Eye Institute. (2024). Cataract surgery. National Institutes of Health. https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/cataracts/cataract-surgery
- de Silva, S. R., Evans, J. R., Kirthi, V., Ziaei, M., & Leyland, M. (2016). Multifocal versus monofocal intraocular lenses after cataract extraction. Cochrane Database of Systematic Reviews, 2016(12), CD003169. https://doi.org/10.1002/14651858.CD003169.pub4
- Findl, O., Buehl, W., Bauer, P., & Sycha, T. (2010). Interventions for preventing posterior capsule opacification. Cochrane Database of Systematic Reviews, 2010(2), CD003738. https://doi.org/10.1002/14651858.CD003738.pub3
- National Eye Institute. (2025). Cataracts. National Institutes of Health. https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/cataracts
