A choroidal nevus is a flat, pigmented spot in the choroid, the vascular layer beneath the retina. It is essentially a freckle inside the eye, and like a freckle on the skin it is common and usually harmless.

Most are discovered incidentally during a routine dilated eye examination in someone with no symptoms at all. The purpose of specialist evaluation is not to treat the nevus but to document it carefully and establish whether it shows any features that warrant closer surveillance.

Why a benign finding is still worth following

The overwhelming majority of choroidal nevi remain unchanged for life and never affect vision. A small proportion, however, can grow, and rarely a lesion that appears to be a nevus is in fact a small choroidal melanoma.

There is no single test that settles this at a first visit. What distinguishes a stable nevus from a growing lesion is, in most cases, observation over time — which is why the standard approach is careful baseline documentation followed by scheduled re-imaging rather than immediate intervention.

This is surveillance in the same sense that a dermatologist photographs and re-checks a mole. It is a precaution, not an indication that something is wrong.

Features that prompt closer attention

Certain characteristics are associated with a higher likelihood of growth and lead to shorter monitoring intervals:

  • Increased thickness of the lesion
  • Subretinal fluid overlying or adjacent to it
  • Orange pigment on the surface
  • Symptoms attributable to the lesion, such as blurring, distortion or flashes
  • Proximity to the optic nerve
  • Absence of drusen or other signs of long-standing stability

A nevus with none of these features and a stable appearance over successive visits is generally followed at longer intervals. Your physician will explain which, if any, apply to your lesion and what interval is appropriate.

The imaging used to document it

Baseline documentation typically combines several methods, each showing something the others do not:

  • Fundus photography records color, size and border, providing the reference image against which later photographs are compared.
  • Optical coherence tomography (OCT) shows the retinal layers above the lesion and detects subretinal fluid that is not visible on examination.
  • Fundus autofluorescence highlights orange pigment and areas of cellular stress.
  • Ocular ultrasound (B-scan) measures thickness, which is among the most useful measurements for tracking change.

These are non-invasive and painless, and the same set is generally repeated at follow-up so that measurements are directly comparable.

What monitoring looks like in practice

After a baseline visit, patients are usually asked to return at an interval determined by the appearance of the lesion — commonly within several months initially, then at longer intervals if it proves stable. Many patients settle into annual imaging.

Between visits, no restrictions or precautions are required, and a nevus does not need to be protected or treated. Sunglasses are sensible for general eye health but do not affect a choroidal nevus.

Contact the office sooner if you develop new blurring, distortion, flashes, floaters or a shadow in the vision of that eye. Those are not expected with a stable nevus, and they are worth examining rather than waiting for the scheduled appointment.

If a lesion does show change

Documented growth or the development of concerning features prompts referral to an ocular oncology service for further evaluation. That referral is a step toward a definitive assessment, not a diagnosis in itself.

The value of the monitoring schedule is precisely that it makes change detectable while lesions are small. This is the reason a benign finding is followed at all.

Choroidal nevus: what patients want to know

No. A nevus is a benign accumulation of pigmented cells, comparable to a freckle or mole. It is monitored because a small number of pigmented lesions in the eye can grow, and observation over time is the most reliable way to distinguish a stable nevus from one that is changing.

Most choroidal nevi cause no symptoms and no change in vision. Vision may be affected if a lesion sits directly beneath the macula or if fluid collects above it, which is one of the things monitoring is designed to detect.

No. Choroidal nevi are common, are generally present without any identifiable cause, and are not the result of anything a patient has done or failed to do. Many are thought to have been present for years before being noticed.

The interval depends on the lesion’s appearance. A nevus with no concerning features may be re-imaged annually after an initial shorter-interval check, while a lesion with features that warrant closer attention is followed more frequently. Your physician will set the schedule based on your imaging.

Removal is not appropriate for a benign choroidal nevus. Any procedure inside the eye carries risk, and the risk of intervention would exceed the risk posed by a stable lesion. Monitoring is the established approach precisely because it avoids unnecessary treatment.

Many stable nevi are followed by an optometrist or general ophthalmologist with appropriate imaging. Specialist evaluation is useful for baseline characterization, when a lesion has features that need closer assessment, or when serial imaging such as ultrasound thickness measurement is required.

Told you have a spot in your eye?

A choroidal nevus is usually harmless, but careful baseline imaging makes future change easy to detect. Call (602) 613-5473 to arrange an evaluation at our Scottsdale office, or contact us.