Just as the sun can harm your skin, it can also affect your eyes and potentially impact your vision. So as you apply your suncream, you should also be thinking about ways to protect your eyes from UV damage on sunnier days.
Heat exhaustion and heatstroke (or sunstroke)
Now that temperatures are warming up, you need to be careful spending time in the sun, as it can make you feel ill. During warmer months, many people tend to get heat exhaustion from dehydration and spending prolonged periods outside. For some people, this can even develop into heatstroke (or sunstroke).
What’s the difference between heat exhaustion and heatstroke (or sunstroke)?
Heatstroke is a more severe form of heat exhaustion. With heat exhaustion, you may get a headache or feel dizzy, but you should be able to cool yourself down and feel better within 30 minutes by drinking plenty of water and avoiding the sun. However, if you continue to feel ill, then you may have heatstroke, which is to be treated as an emergency, and you should call 999 immediately.
How does heat exhaustion impact your eyes?
Heat exhaustion can affect your vision in a few ways. When you are hot and dizzy, your sight can become blurred, or you may experience double vision and find it hard to focus. Being dehydrated also impacts your eyesight: heat exhaustion will not directly cause red eyes, but dehydration can increase the likelihood of soreness and eye irritation.
Can heat stroke affect your eyes?
Yes! As well as potential blurred vision, some people experience issues with pupil dilation and constriction when suffering from heatstroke. A form of involuntary eye movement has also been occasionally noticed in people with heatstroke, but only in very low numbers.1
For Multiple Sclerosis (MS) sufferers, there can be a specific reaction to increased heat exposure known as Uhtoff’s phenomenon. This is explained as the ‘deterioration of visual acuity’ caused by an increase in body temperature.2 The symptoms however are only temporary (lasting less than 24 hours), and your sight should improve as your body begins to cool down.
What to do if you’re experiencing heat exhaustion or heatstroke
The most important thing to do is to cool yourself down. If you are suffering from heat exhaustion, move to a cool, shaded place and drink plenty of water. You can also try to cool your skin by spraying water or getting a friend to fan you.
If you have tried these cooling methods and you still feel unwell, you may have heatstroke, so call 111 for medical assistance.
Sunburned eyes (photokeratitis)
Sunburned eyes (also known as photokeratitis or snow blindness) happen when you are overexposed to harmful UV rays (usually from the sun) without the correct eye protection. This can occur when sunlight reflects off concrete, sand, water and snow.3 The overexposure to your eye damages the cornea’s outer layer, temporarily causing it to become inflamed and sore.
Although photokeratitis is often known as snow blindness — commonly affecting skiers blinded by the sun’s reflection off the snow — anyone can experience sunburned eyes if they are exposed to high amounts of sunlight without wearing the right protection.
The NHS recommends the following groups of people need to take more care in the sun:
- Have pale, white or light brown skin
- Have freckles or red/fair hair
- More likely to burn rather than tan
- Have lots of moles
- Have skin problems relating to a medical condition
- Occasional exposure to intense sun or live in a hot country where the sun is intense
- Have a family history of skin cancer.3
Can your eyes be sunburned?
Yes! Both the skin around your eyes, as well as your eyes themselves, can be susceptible to sun damage. Without the correct protection, the sun’s UV rays can burn your eyes, potentially damaging your vision. Sunburn also increases your risk of skin cancer.3 In particular, basal cell carcinoma, which commonly develops on areas most exposed to the sun, such as your face, including eyelids and the skin around the eye.4
Symptoms of sunburned eyes: what do they feel like?
When your eyes are sunburned it can feel quite painful. Your eyes will go red/ bloodshot and may even water. They will also feel very itchy but you mustn’t rub or scratch them as this could make them worse.
Some other symptoms of sunburned eyes to look out for are: blurred vision, sensitivity to light, and the feeling of grit or sand in your eyes.
How do you treat sunburned eyes?
- Swap contacts for sunnies — if you wear contact lenses, take them out to avoid irritation, and make sure you wear your sunglasses to protect your eyes while they heal. You can check out our range of prescription sunglasses here.
- Get inside — to prevent any further damage to your eyes, you should avoid direct exposure to sunlight, and go indoors until your symptoms subside.
- Cool down — to help with your symptoms, place a cold compress or a fresh, damp cloth over closed eyes to cool them down.
- Avoid itching — we know it can be hard, but try not to rub or itch your eyes as this will make them worse.
- See your optician — if these treatments aren’t helping and your eyes continue to feel sore for over 48 hours, you should visit your opticians so they can check your eye health.
How long do sunburned eyes take to heal?
This depends on the extent of the damage and sunburn, but generally, symptoms tend to improve between 24 and 48 hours following sun exposure. Most people also benefit from some form of eye drops or ointment to help the healing process.
How to protect your eyes against the sun
Now you know what harm the sun can do, you may be wondering what you can do to protect your eyes from this damage.
Get some sunglasses
Make sure that you own a good pair of sunglasses with UV protection. Look for glasses carrying the CE mark, or the British Standard (BS EN ISO 12312-1:2013), as this ensures they match up to the appropriate safety standards.
You can also visit our page on UV protection to decide which type of sunglasses treatment is best for you.
You should try and wear clothing that offers sun protection, on top of wearing sunglasses.
Clothes such as a wide-brimmed hat that shades the face, neck and ears; a long-sleeved t-shirt; and trousers and maxi-skirts that don’t allow sunlight through can help to keep you protected from the strong UV rays.3
Avoid the sun (and sunbeds)
We all know how much the warm weather can be nice, and we’re not telling you to avoid the sun altogether, but you need to be careful when spending time outdoors. You should never look directly at the sun as this can damage your eyes, and limiting your time in the heat will also make you less likely to get heat exhaustion or heatstroke, keeping your eyes healthy.
Equally, the UV rays emitted by sunbeds can also be damaging to your eyes, so be careful and ensure you wear the correct eye protection.
Test your eyes regularly
We recommend that you get your eyes tested every 2 years. However, it is best to come in sooner if you have particular concerns about your eye health or if you are advised by your optometrist.