Choroidal Nevus vs. Ocular Melanoma: What Patients Should Know About a “Freckle” in the Eye
- David B. Sabin
- Jun 23
- 4 min read
A choroidal nevus is often described as a “freckle” or pigmented spot inside the eye. It forms in the choroid, the layer of blood vessels underneath the retina. Most choroidal nevi are benign and do not cause vision problems, but they should be monitored because, rarely, a nevus can show signs concerning for ocular melanoma, a serious eye cancer.
At OPT-ISM, a comprehensive eye exam can help detect and monitor changes in the back of the eye, including choroidal nevi, retinal lesions, and other conditions that may not cause symptoms early on.
What Is a Choroidal Nevus?
A choroidal nevus is a flat or slightly elevated pigmented spot inside the eye. Similar to a mole on the skin, it is made up of pigment-producing cells. Many patients do not know they have one until it is found during a dilated eye exam or retinal imaging.
Most choroidal nevi are harmless, but eye doctors watch them closely for changes in:
Size
Thickness
Color
Orange pigment
Fluid under the retina
Location near the optic nerve
Symptoms such as blurry vision, flashes, or distortion
These features help determine whether a spot looks stable or whether it needs closer monitoring or referral to a retinal specialist or ocular oncology specialist.
What Is Ocular Melanoma?
Ocular melanoma, also called eye melanoma, is a cancer that can develop inside the eye. The most common type starts in the uvea, which includes the iris, ciliary body, and choroid. Choroidal melanoma is the most common form of uveal melanoma.
Ocular melanoma is different from common skin melanoma, but both involve pigment-producing cells. It may not cause symptoms in the early stages, which is why routine eye exams and retinal imaging are important.
Symptoms That Should Not Be Ignored
Many choroidal nevi do not cause symptoms. However, patients should schedule an eye exam promptly if they notice:
New blurry vision
Distorted vision or wavy lines
New flashes of light
New floaters
A shadow, curtain, or missing area in vision
Sudden vision loss
A change in peripheral vision
Eye melanoma can sometimes be found during an exam before a patient notices vision changes. However, sudden changes in vision should be treated as urgent.
How Eye Doctors Monitor a Choroidal Nevus
Monitoring is important because the goal is to document whether the lesion is stable or changing over time. Your eye doctor may use several tests, including:
Dilated Eye Exam
A dilated exam allows the doctor to carefully evaluate the retina, optic nerve, and choroid. This helps determine the size, color, location, and appearance of the nevus.
Retinal Photography
Retinal photos provide a baseline image so future exams can be compared for growth or changes in shape, borders, or pigmentation.
OCT Imaging
OCT is a detailed scan of the retina. It can help detect fluid under or near a nevus, which may be a concerning feature.
Ultrasound
If a lesion appears elevated or suspicious, an ultrasound may be used to measure thickness and look at internal characteristics. Greater thickness and certain ultrasound features have been associated with higher concern for melanoma transformation.
When Is a Choroidal Nevus More Concerning?
Eye doctors look for risk factors that may suggest a nevus needs closer follow-up or referral. Some concerning features include:
Increased thickness
Subretinal fluid
Orange pigment
Symptoms
Location close to the optic nerve
Documented growth over time
Certain ultrasound findings
Lack of chronic benign features such as drusen or halo
A large study of choroidal nevi found that thickness, fluid, symptoms, orange pigment, and location near the optic nerve were among the features associated with a higher risk of transformation into melanoma.
Does Every Choroidal Nevus Need Treatment?
No. Most choroidal nevi do not need treatment. They usually need observation with periodic eye exams and imaging. The follow-up schedule depends on how the lesion looks, whether it has risk factors, and whether it has changed over time.
If the spot looks suspicious, your eye doctor may refer you to a retina specialist or ocular oncology specialist for additional testing and management.
Why Routine Eye Exams Matter
A choroidal nevus is often painless and may not affect vision. Without a dilated eye exam or retinal imaging, many patients would never know it is there.
Routine eye exams are especially important because they allow your doctor to:
Establish a baseline
Compare photos over time
Detect small changes early
Decide whether monitoring or referral is needed
Rule out other retinal or choroidal conditions
Schedule an Eye Exam at OPT-ISM
If you were told you have a freckle in the back of your eye, or if you have new vision changes, an eye exam can help determine whether the area appears stable or needs closer monitoring.
At OPT-ISM, we use comprehensive eye exams and retinal imaging to evaluate the health of the back of the eye and help patients understand what their findings mean.
Schedule an eye exam today to check your retinal health and monitor changes before they become more serious.
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