Why Does Light Cause So Much Glare? Is It Just Aging? Signs to Check for Cataracts and Dry Eyes
If glare has become so severe that looking at light is difficult, it should not simply be dismissed as a sign of aging. Light sensitivity, also known as photophobia, refers to unusual discomfort in bright light and can have many causes, ranging from dry eyes and eye strain to cataracts, corneal or uveal disorders, and migraines.
Singer Jung Mi-jo revealed on a television program that she has found it difficult to look at light for several years, has been wearing sunglasses, and has been unable to continue her painting activities. Her remarks have prompted some people experiencing similar symptoms to wonder what might be causing them. However, her public statements alone are not sufficient to determine whether she has a specific eye condition.
Difficulty Looking at Bright Light May Be a Sign of Photophobia
Photophobia is not so much the name of a particular disease as a symptom involving an abnormally heightened sensitivity to light, causing glare or discomfort when exposed to it.
Symptoms may become noticeable not only in sunlight but also when looking at television studio lights, vehicle headlights, strong indoor lighting, or screens. Eye strain can also increase sensitivity to light, while dry eyes and uncorrected vision problems may contribute to worsening eye strain.
Therefore, glare alone is not enough to identify aging, cataracts, or any other specific condition as the cause.
If Glare Has Worsened With Age, Cataracts Should Also Be Checked
If glare has become noticeably worse with age, cataracts are among the common causes that an ophthalmologist may investigate.
According to the Korea Disease Control and Prevention Agency's National Health Information Portal, a cataract is a condition in which the eye's natural lens becomes cloudy. As the condition progresses, vision may become blurred. In addition, when looking at bright lights such as vehicle headlights or streetlights, light passing through the lens may scatter, causing lights to appear spread out or producing glare.
It is particularly important to distinguish ordinary glare from other eye problems if any of the following changes occur at the same time.
| Accompanying change | Why it should be checked |
|---|---|
| Blurred or cloudy vision | To identify cataracts or other causes of reduced vision |
| Lights appear to spread or have halos | Possible light scattering caused by lens clouding or other factors |
| Greater difficulty seeing during the day | May occur with certain types of cataracts |
| Night driving has become difficult | Headlight glare may interfere with everyday activities |
| Objects appear doubled or overlapping | An ophthalmic evaluation is needed to identify the cause |
The Korea Disease Control and Prevention Agency explains that cataracts are diagnosed through ophthalmic assessments, including visual acuity testing, slit-lamp examination, ophthalmoscopy, and intraocular pressure measurement.
Not All Light Sensitivity Is Caused by Cataracts
Discomfort from light should not automatically be attributed to cataracts.
For example, dry eyes and eye strain caused by prolonged screen use can also increase sensitivity to light. Conversely, photophobia may occur with conditions requiring prompt medical attention, such as keratitis or inflammation of the iris or uvea. Keratitis may be accompanied by eye pain, reduced vision, a foreign-body sensation, and light sensitivity. Iritis can also cause pain that worsens in bright light, redness, and decreased vision.
Because causes unrelated to the eye itself, such as migraines, are also possible, persistent symptoms should be evaluated through appropriate examinations rather than assuming they are simply age-related vision changes.
For reference, presbyopia is an age-related change primarily involving a reduced ability to focus on nearby objects. Its typical symptoms include blurred near vision and eye fatigue while reading. It is therefore not the same as light sensitivity severe enough to make looking at light difficult.
Can Wearing Sunglasses Solve the Problem?
Sunglasses are useful for protecting the eyes from strong sunlight and ultraviolet radiation and for reducing glare. However, they are not a substitute for examinations or treatment aimed at identifying the cause of persistent photophobia.
When choosing sunglasses for outdoor use, ultraviolet protection should be checked before considering how dark the lenses are. A government policy briefing explains that products marked `UV400` block at least 99% of ultraviolet radiation at wavelengths of 400nm or below.
Therefore, when selecting sunglasses to protect eye health, it is important to check the UV protection label rather than relying solely on dark lenses.
However, if ordinary indoor lighting or everyday light has become so difficult to tolerate that sunglasses must be worn continuously, determining whether an ophthalmic examination is necessary should take priority over choosing sunglasses.
When Glare Should Prompt Medical Attention Without Delay
The appropriate response may differ depending on whether glare has developed gradually over a long period or appeared suddenly.
In particular, sudden deterioration or loss of vision, severe eye pain, double vision, flashes of light or new floaters, rainbow-colored halos around lights, severe headaches, nausea, or vomiting accompanying light sensitivity require prompt medical evaluation.
If the eyes become severely red and exposure to light is difficult, especially when accompanied by pain or blurred vision, it is also advisable not to wait too long under the assumption that the symptoms are simply caused by fatigue.
On the other hand, if mild glare occurs only after prolonged screen use and improves with rest, it may be worth considering whether eye strain or dryness is contributing to the symptoms. However, if the symptoms recur despite self-care or begin interfering with everyday activities such as reading, driving, or working, an ophthalmologist should evaluate the cause.
Why You Should Not Dismiss Glare as a Normal Part of Aging
Although various changes occur in the eyes with age, glare itself does not constitute a diagnosis of normal aging.
This is because glare may occur with age-related conditions such as cataracts, as well as other causes including problems affecting the eye's surface or inflammation.
In particular, if sunlight or lighting that was previously comfortable has recently become unusually difficult to tolerate, or if the change is accompanied by halos or spreading light, blurred vision, pain, or redness, examinations to distinguish the underlying cause are more important than simply masking the symptoms.
A specific condition cannot be diagnosed from symptoms alone. The exact cause and whether treatment is necessary should be determined through an ophthalmic consultation.
Related Articles
Is Mild Cognitive Impairment Dementia? Differences, Tests, and How to Use Dementia Support Centers