Eye Cancer: 9 Critical Signs You Should Never Ignore

Eye cancer is rare, but it deserves attention because some types can develop without obvious symptoms at first.

The term includes several different cancers. Some begin inside the eyeball, while others affect the conjunctiva, eyelid, retina, or tissues around the eye. Cancer from another part of the body can also spread to the eye.

The most important point is simple: a floater, red eye, or blurry vision does not usually mean cancer. These symptoms have many more common causes. However, persistent or unexplained eye changes should not be ignored.

This article is for general information and education. It does not replace medical advice, diagnosis, or treatment.

Eye Cancer: Quick Answer

Eye cancer happens when abnormal cells grow uncontrollably in or around the eye.

One of the most important adult types is uveal melanoma, also called ocular or intraocular melanoma.

Possible symptoms include:

• Blurred or distorted vision
• Flashes of light
• New or changing floaters
• A growing dark spot on the iris
• A change in pupil size or shape
• Loss of part of the visual field
• A growing lump on the eye or eyelid
• Bulging of one eye

Some eye cancers cause no symptoms at first and are discovered during a routine eye examination.

Most people with flashes, floaters, blurred vision, or eyelid lumps do not have cancer. The important step is having persistent or unusual changes properly assessed.

What Types of Eye Cancer Are There?

Eye cancer is not one single disease.

Different cancers can start in different parts of the eye.

Uveal Melanoma

Uveal melanoma develops from pigment producing cells in the uvea.

The uvea includes:

• The iris
• The ciliary body
• The choroid

Most uveal melanomas begin in the choroid.

This is the most common primary cancer that develops inside the adult eye, but it is still rare compared with many other cancers.

Iris Melanoma

Iris melanoma develops in the coloured part of the eye.

A changing or enlarging dark spot on the iris deserves examination, although most iris freckles and nevi are benign.

Conjunctival Melanoma

Conjunctival melanoma develops on the thin membrane covering the white part of the eye and inner eyelids.

It can appear as a pigmented area on the surface of the eye.

A new or changing pigmented patch should be assessed.

Eyelid Cancer

The eyelid can develop skin cancers such as basal cell carcinoma, squamous cell carcinoma, and melanoma.

Possible clues include:

• A lump that keeps growing
• A sore that does not heal
• Repeated bleeding or crusting
• Loss of eyelashes around a lesion
• A changing pigmented spot

Eye Lymphoma

Lymphoma can occasionally affect tissues inside or around the eye.

Symptoms can include blurred vision, floaters, redness, or other changes.

Diagnosis requires specialist assessment.

Retinoblastoma

Retinoblastoma is a rare childhood cancer of the retina.

It occurs mainly in very young children.

A classic warning sign is a white glow or white reflection in the pupil, sometimes first noticed in a flash photograph.

9 Critical Eye Cancer Signs to Know

1. Persistent Blurred or Distorted Vision

Blurred vision is extremely common and usually has a non cancer cause.

Common explanations include:

• A glasses prescription change
• Dry eye
• Cataracts
• Diabetes
• Retinal disease

Eye melanoma can also cause blurred or distorted vision, particularly when a tumour affects structures involved in seeing.

The key word is persistent.

A new unexplained vision change deserves assessment.

2. New Flashes or Floaters

Floaters may look like:

• Spots
• Threads
• Squiggly lines
• Cobwebs

Flashes may look like brief streaks or bursts of light.

Eye melanoma can cause these symptoms, but much more common causes include age related vitreous changes and retinal problems.

A sudden increase in flashes or floaters should be assessed urgently because retinal detachment is an important alternative cause.

Our Eye Problems NHS Guide explains these emergency warning signs in more detail.

3. A Growing Dark Spot on the Iris or Eye Surface

A dark spot does not automatically mean melanoma.

Many people have harmless freckles or moles in the eye.

What matters more is change.

Arrange an eye examination if a spot:

• Gets larger
• Changes colour
• Changes shape
• Becomes more raised
• Looks different from previous photographs

Eye specialists can photograph pigmented spots and compare them over time.

4. A Change in Pupil Size or Shape

The pupil is the dark centre of the eye.

Uveal melanoma can occasionally alter its shape or size.

Many other problems can also affect the pupil, so this sign needs professional examination rather than self diagnosis.

5. Loss of Part of Your Vision

Some eye tumours can affect the visual field.

You might notice:

• A missing area
• A shadow
• Reduced side vision
• Persistent dimness

Sudden visual field loss is an emergency because retinal detachment, stroke, and other urgent problems are more common causes.

6. A Growing Lump on the Eyelid or Eye

A small eyelid lump is often a cyst or stye.

However, have a lesion checked if it:

• Keeps growing
• Does not heal
• Bleeds repeatedly
• Ulcerates
• Changes colour
• Causes nearby eyelash loss

A lesion that has been present for weeks without healing deserves medical review.

7. Bulging or a Change in Eye Position

A tumour in or around the eye can sometimes push the eyeball forward or alter its position.

Other causes of bulging include:

• Thyroid eye disease
• Inflammation
• Infection
• Blood vessel problems

A new change in eye position should be assessed.

8. Persistent Irritation or Pain

Pain is not a typical early symptom of uveal melanoma.

Most people with eye melanoma do not have pain.

However, persistent irritation or pain around the eye can occur with some eye cancers or advanced disease.

Much more common causes include:

• Dry eye
• Blepharitis
• Infection
• Inflammation
• Glaucoma

Read our Red Dry Skin Around Eyes Guide if your symptoms mainly involve irritated eyelid skin.

9. A White Pupil in a Child

This sign deserves special attention.

A white reflection in the pupil is called leukocoria.

It may be noticed:

• In normal light
• In a dark room
• In a flash photograph

Retinoblastoma is one possible cause.

Other causes, including childhood cataracts, can also produce a white pupil.

A persistent white pupil should be assessed urgently.

Eye Cancer Symptoms Versus More Common Eye Problems

What Is Uveal Melanoma?

Uveal melanoma begins in melanocytes, the pigment producing cells within the uveal tract.

The uvea has three parts:

• Iris
• Ciliary body
• Choroid

Most cases develop in the choroid.

Some tumours are found during a routine dilated eye examination before they cause symptoms.

Who Is More Likely to Develop Uveal Melanoma?

Having a risk factor does not mean you will develop cancer.

Many people with eye melanoma have no obvious preventable risk factor.

Older Age

Risk increases with age.

Eye melanoma is mainly an adult cancer.

Light Eye Colour

People with blue, grey, green, or other light coloured eyes have a higher risk than people with darker eyes.

Fair Skin

Uveal melanoma is more common in people with lighter skin.

It can still occur in people with darker skin.

Unusual Pigmented Eye Lesions

Certain nevi and areas of increased pigmentation inside or around the eye can raise risk.

Examples include ocular or oculodermal melanocytosis.

Atypical Mole Syndromes

Some people with many unusual skin moles have a higher risk of melanoma, including ocular melanoma.

BAP1 Tumour Predisposition Syndrome

BAP1 tumour predisposition syndrome is a rare inherited condition.

It can increase the risk of several cancers, including:

• Uveal melanoma
• Skin melanoma
• Mesothelioma
• Kidney cancer

Genetic counselling may be appropriate when this syndrome is suspected from a person's cancer history or family history.

Does Sunlight Cause Eye Cancer?

The answer is less certain than many articles suggest.

Ultraviolet radiation clearly contributes to skin cancer.

However, research on ordinary sunlight exposure and uveal melanoma has produced inconsistent results.

Current evidence does not justify saying that sunlight is a proven major cause of uveal melanoma.

You should still protect your eyes from UV radiation for broader eye health.

Choose sunglasses that block 99 to 100 percent of UVA and UVB when appropriate.

Do Sunbeds Increase Eye Cancer Risk?

Sunbeds expose the body and eyes to intense ultraviolet radiation.

Some observational evidence has suggested a possible link with eye melanoma, but the evidence is not as strong as it is for skin cancer.

Avoiding tanning beds is still sensible because of their established skin cancer risk.

Can Welding Increase Risk?

Some studies have found a higher rate of uveal melanoma among welders.

Welding can also cause serious eye injury from intense light and UV exposure.

Appropriate occupational eye protection remains essential.

Can Eye Cancer Be Prevented?

There is no guaranteed way to prevent eye melanoma.

Many important risk factors, such as age, eye colour, skin colour, and genetics, cannot be changed.

Reasonable protective habits include:

• Avoiding tanning beds
• Using appropriate UV protective eyewear
• Using occupational eye protection
• Attending regular eye examinations
• Monitoring known eye nevi when advised

Routine eye exams do not guarantee prevention, but they may identify some tumours before symptoms develop.

Read our National Eye Health Week Guide for practical routine eye care advice.

How Is Eye Cancer Diagnosed?

If an optometrist or doctor sees something suspicious, you may be referred to an ophthalmologist.

An ophthalmologist is a medical doctor specializing in eye disease and surgery.

Tests may include:

Dilated Eye Examination

Eye drops widen the pupil so the specialist can examine the inside of the eye.

This allows detailed assessment of:

• The retina
• The choroid
• The optic nerve
• Other structures

Eye Photography

Special photographs can document a lesion's size, colour, and shape.

Future photographs can then show whether it is changing.

Ultrasound

Eye ultrasound can show the size, thickness, and location of an internal tumour.

Optical Coherence Tomography

OCT creates detailed images of retinal and choroidal structures.

It can help specialists assess certain eye lesions and nearby retinal changes.

Angiography

Special imaging after injected dye may help doctors examine blood flow in and around an abnormal area.

Biopsy

A biopsy is not required in every case of uveal melanoma.

Many eye melanomas can be diagnosed from characteristic findings on examination and imaging.

A biopsy may sometimes be performed to clarify the diagnosis or provide genetic information about the tumour.

Does an Eye Cancer Diagnosis Always Mean the Eye Must Be Removed?

No.

Modern treatment can often preserve the eye.

The best treatment depends on:

• Tumour size
• Tumour location
• Whether vision can be preserved
• Whether the cancer has spread
• The health of the other eye
• Genetic features of the tumour

How Is Uveal Melanoma Treated?

Plaque Radiation Therapy

A small radioactive plaque is temporarily placed on the outside of the eye next to the tumour.

This delivers radiation directly to the cancer.

Proton or Other External Beam Radiation

Some specialist centres use highly targeted radiation such as proton beam therapy.

Surgery

Some tumours can be removed surgically.

Enucleation

Enucleation means removing the eye.

It may still be needed for very large tumours or when an eye cannot reasonably be saved.

Observation

Some small suspicious lesions are monitored closely instead of being treated immediately.

Serial photographs and scans help specialists detect growth.

Can Eye Cancer Spread?

Yes.

Uveal melanoma can spread beyond the eye.

The liver is an important site of metastasis, although other organs can also be affected.

People with higher risk tumours may have ongoing surveillance after treatment.

The exact follow up plan depends on tumour features and specialist recommendations.

Does Tumour Genetics Matter?

Yes.

Uveal melanomas can have genetic features that help predict the chance of the cancer spreading.

Specialists may use tests such as gene expression profiling or chromosome analysis in selected cases.

These tests do not replace ordinary tumour staging.

What About Conjunctival Melanoma?

Conjunctival melanoma is different from uveal melanoma.

It begins on the surface membrane of the eye.

A new or enlarging pigmented lesion on the conjunctiva deserves professional assessment.

People with a condition called primary acquired melanosis can have an increased risk of conjunctival melanoma.

Eye Cancer in Children

Most childhood eye problems are not cancer.

However, retinoblastoma is an important diagnosis not to miss.

It develops in the retina and most often affects very young children.

Retinoblastoma Warning Signs

Possible signs include:

• A white pupil or white glow
• A new squint
• Eyes pointing in different directions
• Vision problems
• Eye redness or pain
• Swelling around the eye
• Uncontrolled eye movements

A child can otherwise look completely well.

Why Does a White Pupil Matter?

In many flash photos, healthy pupils show a reddish reflection.

With retinoblastoma, one pupil may instead appear white or pale.

This is not proof of cancer.

A white pupil can have other causes, including cataracts.

It still needs urgent professional assessment.

Is Retinoblastoma Inherited?

Some cases are linked with an inherited change in the RB1 gene.

Others are not inherited.

Children with an inherited form may develop tumours in both eyes and have a greater risk of some additional cancers later in life.

Genetic counselling and testing can be important for affected families.

Should You Worry About an Eye Freckle?

Usually not.

Many eye freckles and nevi are harmless.

An eye specialist may photograph one and monitor it over time.

Features that make closer follow up useful include:

• Growth
• Increased thickness
• Fluid near the lesion
• Certain pigment changes
• Symptoms

Do not assume that every dark spot is cancer.

Can Floaters Mean Eye Cancer?

They can occur with eye melanoma, but cancer is a rare cause.

Much more common explanations include age related changes in the vitreous.

New floaters matter because they can also signal a retinal tear or detachment.

Seek urgent assessment if new floaters occur with:

• Flashes
• Blurred vision
• A curtain or shadow
• Sudden vision loss

Can Eye Pain Mean Cancer?

Sometimes, but eye pain is uncommon in early uveal melanoma.

Common causes of eye pain include:

• Corneal problems
• Infection
• Uveitis
• Glaucoma
• Injury
• Migraine

Persistent or severe pain should still be assessed.

Can a Routine Eye Test Detect Cancer?

Sometimes.

Eye melanoma may be discovered during a routine dilated examination before symptoms appear.

An optometrist who sees a suspicious lesion can refer you to an ophthalmologist for further assessment.

Routine eye care is therefore useful even when your vision seems normal.

When Should You Arrange an Eye Examination?

Book an appointment if you notice:

• Persistent blurred or distorted vision
• A growing dark spot on the eye
• A pupil that has changed shape
• A persistent eyelid lump
• An eyelid lesion that repeatedly bleeds
• Progressive vision loss
• A change in the position of the eye
• Persistent unexplained irritation

When Is Eye Care Urgent?

Seek urgent assessment for:

• Sudden vision loss
• A dark curtain across vision
• A sudden shower of new floaters
• New flashes with vision changes
• Severe eye pain
• A serious eye injury
• A painful red eye with reduced vision

These symptoms are more likely to have another urgent cause than cancer, but waiting can threaten vision.

When Does a Child Need Urgent Assessment?

Arrange urgent medical assessment if you notice:

• A persistent white pupil
• A white reflection in flash photographs
• A new squint
• Uncontrolled eye movements
• Eye swelling
• Eye pain
• Possible vision loss

These signs do not prove retinoblastoma, but they should not be ignored.

Eye Cancer Risk Factor Table

Common Myths About Eye Cancer

Myth 1: Eye Cancer Always Causes Pain

False.

Uveal melanoma often causes no pain and may have no early symptoms.

Myth 2: Every Eye Floater Could Be Cancer

False.

Floaters are common and usually have non cancer causes.

Sudden new floaters still need attention because retinal disease can be urgent.

Myth 3: Every Dark Spot in the Eye Is Melanoma

False.

Most eye freckles and nevi are benign.

Growth or change is more concerning than simply having a pigmented spot.

Myth 4: Eye Cancer Always Means Losing the Eye

False.

Many uveal melanomas can be treated with eye preserving radiation or other approaches.

Myth 5: Sunglasses Guarantee Prevention

False.

UV protection is sensible for general eye health, but there is no proven way to prevent all eye cancers.

Myth 6: Eye Cancer Only Affects Adults

False.

Retinoblastoma is a rare childhood eye cancer.

What to Do if You Are Worried About Eye Cancer

1. Write down the change. Note when it began and whether it is worsening.
2. Photograph visible changes. A photo can help document changes in an eyelid lesion or visible eye spot.
3. Arrange an eye examination. An optometrist or ophthalmologist can examine structures you cannot see yourself.
4. Mention relevant history. Tell the clinician about previous melanoma, unusual eye moles, BAP1 syndrome, or important family cancer history.
5. Do not wait for pain. Eye melanoma may be painless.

Conclusion

Eye cancer is uncommon, and most eye symptoms have causes that are far more common and less serious.

Still, it is worth knowing the warning signs. Persistent blurred vision, flashes or floaters, a growing dark spot, changes in pupil shape, progressive vision loss, a growing eyelid lesion, or a bulging eye should be assessed rather than ignored.

In children, a persistent white pupil or unusual white reflection in photographs deserves urgent attention because it can be a sign of retinoblastoma.

Your next step is simple: if you have noticed a new or unexplained eye change, book a professional eye examination. Early evaluation can identify common treatable eye problems as well as the much rarer serious conditions.

References and Sources

1. National Cancer Institute. Intraocular Uveal Melanoma Treatment, Patient Version.
   https://www.cancer.gov/types/eye/patient/intraocular-melanoma-treatment-pdq
2. NHS. Eye Cancer.
   https://www.nhs.uk/conditions/eye-cancer/
3. American Cancer Society. Signs and Symptoms of Eye Cancer.
   https://www.cancer.org/cancer/types/eye-cancer/detection-diagnosis-staging/signs-symptoms.html
4. American Cancer Society. Risk Factors for Eye Cancer.
   https://www.cancer.org/cancer/types/eye-cancer/causes-risks-prevention/risk-factors.html
5. National Cancer Institute. Retinoblastoma Treatment, Patient Version.
   https://www.cancer.gov/types/retinoblastoma/patient/retinoblastoma-treatment-pdq
6. NHS. Symptoms of Retinoblastoma.
   https://www.nhs.uk/conditions/retinoblastoma/symptoms/

Internal Links + Hub

• Eye Problems NHS Guide
• National Eye Health Week
• Red Dry Skin Around Eyes
• Foods for Eye Health
• Senior Eye Care Guide
• Nutrition & Vitamins Hub

Frequently Asked Questions

What is eye cancer?

Eye cancer is cancer that begins in or around the eye. Types include uveal melanoma, conjunctival melanoma, eyelid cancers, lymphoma, and retinoblastoma in children.

What are the first signs of eye cancer?

Eye cancer may have no early symptoms. Possible signs include persistent blurred vision, flashes or floaters, a growing dark spot on the eye, pupil changes, loss of part of the visual field, a growing lump, or bulging of one eye.

Does eye cancer hurt?

Usually not in its early stages. Pain is considered uncommon in uveal melanoma, although some advanced eye tumours or other eye conditions can cause pain.

Can an eye test detect eye cancer?

Yes. Some eye tumours are found during routine eye examinations before symptoms appear. Suspicious findings can then be referred to an ophthalmologist or specialist eye cancer centre.

Are eye floaters a sign of cancer?

They can occur with eye melanoma, but cancer is a rare cause of floaters. Sudden new floaters need urgent assessment mainly because retinal tears and detachment are more common urgent causes.

Is a dark spot on the iris cancer?

Usually not. Many iris freckles and nevi are benign. A spot that grows or changes in colour, size, or shape should be assessed by an eye professional.

What increases the risk of eye melanoma?

Known risk factors include older age, light eye colour, fair skin, certain pigmented eye conditions, unusual mole syndromes, and rare inherited conditions such as BAP1 tumour predisposition syndrome.

Does sunlight cause eye melanoma?

The evidence is uncertain. Studies of ordinary sunlight exposure and uveal melanoma have produced mixed results. UV eye protection is still sensible for overall eye and skin health.

Can eye cancer be cured?

Treatment success depends on the cancer type, size, location, genetic features, and whether it has spread. Localised eye melanoma can often be treated with radiation or surgery, and some treatments preserve the eye.

What is the main sign of retinoblastoma in children?

A white pupil or white glow in the pupil is an important warning sign. It may appear in ordinary light or flash photographs. A new squint, vision problems, swelling, or unusual eye movements can also occur.

Does a white pupil always mean retinoblastoma?

No. Cataracts and other eye conditions can also cause a white pupil, but the finding should be assessed urgently because retinoblastoma is one possible cause.

When should I get an eye change checked?

Arrange an eye examination when you notice a persistent or unexplained change in vision, a growing eye spot, a pupil change, a persistent eyelid lesion, or an unusual change in eye position. Sudden vision loss or a new curtain across vision needs urgent care.

Adel Galal

Health & wellness writer with 30+ years of experience in nutrition, fitness, and healthy aging. Founder of NextFitLife.com — evidence-based health guidance.