The child who hates bright light: how to tell what it means
Some children screw up their eyes the moment they step outside and are perfectly well. In others, light sensitivity is the first thing anyone notices about a serious problem. Here is how I tell them apart.
- Photophobia is a symptom, not a diagnosis. A child who dislikes bright sun but has white, comfortable eyes and normal sight is usually at the ordinary end of it.
- Two questions do most of the sorting: is the eye otherwise normal, and did anything else arrive with the light sensitivity.
- Light sensitivity together with a red eye, pain, watering or a change in vision is never a wait and see, because uveitis behaves exactly like that and is treatable.
- In a baby or toddler, light sensitivity plus eyes or corneas that look larger than usual, or a cornea that looks cloudy or grey, goes to an eye emergency the same day.
- Children with juvenile idiopathic arthritis are checked for eye inflammation even when their eyes feel completely fine, because that kind can be silent.
Two children come to my clinic in the same week with the same complaint. He hates bright light, doctor. He screws his eyes up the moment we step outside. One of them needs a hat. The other one needs to be seen today.
Disliking light has a name, photophobia, and the name is not a diagnosis. It is a symptom that sits at the end of several completely different stories, so the useful thing is not a list of causes. It is the two questions that sort them.
My toddler hides her face from the light, is that normal?
Often, yes. Malaysian midday sun is genuinely punishing and small children have no vocabulary for glare, so they do the only thing available to them: screw their eyes up, turn away, and complain. A child who does that outside, settles the moment she is under a roof, has white and comfortable eyes and sees perfectly well is at the ordinary end of this.
There is another ordinary version I see every clinic day, and it is one I cause myself. A child who has had dilating drops has wide pupils for roughly a day, sometimes into the next, and while they are wide, light feels harsh and near vision is blurry. That is expected, it passes, and a hat for the trip home is the whole treatment. For everyday glare, shade and a broad brim do more for children's eyes than most parents expect.
So far, so unremarkable. The reason I still take the complaint seriously is that light sensitivity is also the first thing anyone notices in a few conditions where noticing early changes the outcome.
How do I tell that apart from something that needs a doctor?
Two questions, and you can answer both at your kitchen table. The first: is the eye otherwise normal? White, comfortable, not watering, not red, seeing as well as it did last month. The second: did anything else arrive with it?
Anything else means pain, redness, watering, a change in vision, a knock to the eye or the head, a splash, a headache, a fever, a lid that has started to droop, or eyes that look different from how they looked before. If both answers are reassuring, and the sensitivity is not new, you are almost certainly dealing with a child who dislikes glare.
And the word that lifts the urgency, here as everywhere in children's eyes, is new. Light that has started hurting this week, in a child who was never bothered before, is worth an examination rather than a wait.
Her eye is red and the light hurts, is that just conjunctivitis?
It might be. But that exact combination is also how uveitis behaves, and uveitis is the reason nobody in my field lets a red, light-sensitive, painful eye drift for a week. Uveitis is inflammation inside the eye rather than on its surface. It can come on over hours and days, or creep in over weeks and months, and it is treatable. It is treated quickly because it is delay, not the inflammation itself, that does the lasting harm.
The signs that push a red eye out of the ordinary and into the same-week category are pain, sensitivity to light, watering, and any change in vision, blurring or flashes or dark spots included. In the British system a suspected case is aimed at an eye specialist within a day, which tells you how seriously it is taken there. Here, that translates into ringing an eye clinic or going to a hospital eye department rather than waiting to see whether it clears like the last one did.
If the eye is red and sticky, the child is comfortable, the light is not hurting and the vision is unchanged, that is a different picture, and ordinary conjunctivitis in children is far more common than uveitis. I am not asking you to fear every red eye. I am asking you to notice when light and pain join it.
My son has juvenile arthritis, why does he need eye appointments?
Because this kind of inflammation can be completely silent. A child with juvenile idiopathic arthritis can have active inflammation inside the eye with no pain, no redness, and nothing at all to complain about. That is precisely why it is looked for on a schedule rather than waited for, and why the rheumatology team, not the parents, usually sets the eye referral going.
When you go, the eye team will ask how many joints are involved, whether the antinuclear antibody test was positive, and how old he was when the arthritis started. Those answers shape the plan, so take the letters with you. Photophobia is the first sign on the list that a referring doctor is asked to record, alongside the shape of the pupil and whether the cornea looks clear.
The hardest part of this is the stretches where nothing seems wrong. A well child, a well eye, another appointment. Keep them anyway. Those quiet appointments are the entire point of the exercise.
His eyes look big and cloudy and he hates the light, what should I do?
Take him to an eye emergency today. In a baby or a small child, three signs travel together and children's eye services treat all three as high risk: eyes or corneas that look bigger than usual, a cornea that looks cloudy or grey, and a child who is unusually sensitive to light. That combination is how glaucoma presents in a small child, and it is the one situation in this article where the answer is hours.
The cruelty of it is that big eyes in a baby get admired. Relatives coo about beautiful big eyes and nobody in the family says the quiet part, which is that the eye is enlarging because the pressure inside it is too high. Cloudiness and light sensitivity are the two things that turn a compliment into a symptom.
Two other pictures belong in the same paragraph. After any knock to the eye, light hurting is on the emergency list, along with reduced vision, whiteness or cloudiness on the cornea, blood visible in front of the coloured part of the eye, or a pupil that has changed shape. And if a child has been treated for a scratch on the surface of the eye but is still not comfortable opening it after two days, or the sight has dropped, that is a phone call rather than a wait. In a teenager, new light sensitivity alongside vision that keeps blurring and a glasses prescription that keeps changing points somewhere else again, towards the cornea itself, and it needs a proper look rather than another new pair of glasses. Persistent light sensitivity in a small child with an eye that keeps watering is also worth mentioning, because lashes turning inwards and brushing the eye is a simple, fixable cause that hides in plain sight.
Does light sensitivity mean migraine in a child?
Not on its own, and I would gently steer you away from settling that question at home. Migraine has a recognisable shape: a throbbing headache, often on one side and worse with movement, feeling or being sick, and strong sensitivity to both light and sound. The child wants a dark quiet room and sleep, the attack runs for hours rather than minutes, and then it lifts. Some children see zigzags or flashing lights beforehand, and that part should not last more than about an hour.
If that pattern repeats, take it to your doctor, who is the person to make the diagnosis and to decide what is needed. Light sensitivity without the rest of the pattern is not migraine, and headaches in a child have plenty of other explanations, including one from my own field: the headache that only ever shows up around homework.
One list stands outside all of this. A headache that came on suddenly and is extremely painful, drowsiness or confusion, weakness down one side or in the face, trouble speaking, a fit, a loss or blurring of vision, or a high temperature with the signs of meningitis: that is an emergency department, immediately, and it is not an eye appointment. It is a short list and it is rare, and the reason I print it is that a parent who knows it can stop scanning for it the rest of the time.
- Your baby or toddler hates the light and the eyes or corneas look bigger than usual, or a cornea looks cloudy or grey.
- Light sensitivity comes with eye pain, a very red eye, watering, or vision that has changed.
- The light started hurting after a knock to the eye or the head, or after anything splashed into the eye.
- Your child has been treated for a scratch on the eye and is still not comfortable opening it, or the sight is worse, after two days.
- There is a sudden, extremely painful headache, drowsiness, confusion, weakness, a fit, or a high temperature with a rash and a stiff neck. That is an emergency department, not an eye clinic.
Common questions
My toddler screams and hides her face whenever we go outside, is that normal?
He is suddenly very bothered by light, should I be worried?
Her eye is red and the light hurts, is that just conjunctivitis?
Does light sensitivity mean migraine in a child?
My son has juvenile arthritis, why does he need eye appointments when his eyes are fine?
His eyes look big and a bit cloudy and he hates the light, what should I do?
Would sunglasses fix it?
She had drops at the eye clinic and now the light hurts, is that expected?
- Moorfields Eye Hospital · Glaucoma (suspected), children's eye conditions management · www.moorfields.nhs.uk
- NHS · Uveitis · www.nhs.uk
- Moorfields Eye Hospital · Uveitis screening in children with arthritis · www.moorfields.nhs.uk
- Moorfields Eye Hospital · Eye trauma, children's eye conditions management · www.moorfields.nhs.uk
- NHS · Migraine · www.nhs.uk
- AAPOS · Keratoconus · aapos.org
- NHS · Eyelid problems · www.nhs.uk