Eye cancer can be difficult to detect because its symptoms are not always obvious.
Some cases are only discovered during a routine eye examination, according to Cancer Research UK.
Bulging eye
One possible symptom is that one eye begins to protrude more than usual.
This change may develop gradually over time and should be examined by a healthcare professional.
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Partial or complete vision loss
Eye cancer can cause vision to deteriorate or result in partial or complete vision loss.
If your vision changes without an obvious explanation, it should be taken seriously.
Pain in or around the eye
Pain in or around the eye can occur, but it is a relatively uncommon symptom of eye cancer.
Most people with the disease do not experience pain in its early stages.
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Pale raised area on the surface of the eye
A pale, raised lump on the conjunctiva or cornea may be a possible symptom.
This change may be visible on the surface of the eye and should be assessed by a healthcare professional.
Blurred vision
Blurred or unclear vision can be one of the signs of eye cancer.
If your vision remains blurred, it is important to have your eyes examined.
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Changes in the appearance of the eye
A change in the appearance of the eye may be a symptom of the disease.
It may involve a visible change that was not previously present.
Lump on or around the eyelid
A lump on the eyelid or around the eye may be a possible sign of eye cancer.
This is a change that should be examined further.
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Spots or flashes of light in your vision
Some people experience spots, flashes of light, or wavy lines in their field of vision.
These visual disturbances may be among the possible symptoms.
Reduced peripheral vision
The disease can cause a loss of peripheral vision while central vision remains clear.
This means you may have difficulty seeing objects located to the sides.
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Dark spot on the iris
A dark spot on the colored part of the eye may be a symptom, especially if it increases in size over time.
Such a change should be evaluated by a doctor or an optometrist.
Irritation or red eye
Persistent irritation, a red eye, or chronic inflammation of the conjunctiva may also be symptoms.
If these symptoms do not go away, it is important to have them examined.
Pain may be caused by increased pressure
If pain develops, it may be because the cancer has spread beyond the eye or because the pressure inside the eye has become too high.
Get your symptoms checked
Eye cancer is a rare disease, and many of its symptoms can also be caused by other eye conditions.
For this reason, it is recommended that you contact a general practitioner or an optometrist if you experience one or more of these symptoms.
Early detection can improve treatment
The earlier eye cancer is detected, the easier it is generally to treat.
An early diagnosis also increases the likelihood that treatment will be successful.