Leukemia can affect almost every part of the eye, and the ocular manifestations of leukemia range from painless retinal bleeding seen only on an eye exam to sudden vision loss from leukemic cells infiltrating the optic nerve. Most eye findings come from low platelets, anemia, or very high white cell counts rather than from cancer cells in the eye itself. Occasionally, an eye doctor is the first to suspect leukemia, and in patients already on treatment, new eye symptoms can signal relapse, infection, or a drug side effect.
In my practice, I ask every newly diagnosed patient about their vision, because the eye is one of the few places where we can look directly at blood vessels and see the effects of the disease.
Why Leukemia Affects the Eyes
Leukemia is a cancer of blood-forming cells that begins in the spongy tissue inside bones, where the bone marrow produces blood cells. When it produces large numbers of abnormal white blood cells, normal red cells and platelets are crowded out.
The eye is affected in two broad ways:
- Direct (primary) involvement: leukemic cells infiltrate eye tissues such as the retina, optic nerve, iris, or the eye socket (orbit).
- Indirect (secondary) involvement: changes caused by the blood abnormalities, including bleeding from low platelets, oxygen-starved retina from anemia, sludging of blood when white counts are extremely high, and infections from a weakened immune system.
Eye findings are seen in both acute and chronic leukemias, but they are more common in acute leukemia, where counts change quickly and dramatically.
Common Ocular Manifestations
The retina, the light-sensitive layer at the back of the eye, is the part most often affected. The table below summarizes the main findings.
| Eye finding | Main cause | What the patient may notice |
|---|---|---|
| Retinal hemorrhages | Low platelets and anemia | Often nothing; blurred vision or a dark spot if near the center |
| Roth spots (white-centered hemorrhages) | Bleeding around a pale center of fibrin or leukemic cells | Usually no symptoms |
| Cotton wool spots | Small areas of retina starved of blood flow | Usually no symptoms |
| Dilated, twisting retinal veins | Leukostasis from very high white counts | Blurred vision |
| Subconjunctival hemorrhage | Low platelets | A bright red patch on the white of the eye |
| Optic nerve infiltration | Leukemic cells in the nerve | Rapid, often painless loss of vision; an emergency |
| Orbital mass (myeloid sarcoma) | Collection of leukemic cells, mostly in AML | Bulging eye, swelling, or double vision |
| Anterior chamber infiltration | Leukemic cells in the front of the eye | A red, painful eye, sometimes with raised eye pressure |
Retinal hemorrhages usually reflect how low the platelet count and hemoglobin are, and they often fade once counts recover. Optic nerve and anterior chamber involvement are less common but important, because they can indicate disease in the central nervous system or relapse in “sanctuary sites” that chemotherapy reaches poorly, a recognized issue in acute lymphoblastic leukemia.
Eye Problems Linked to Treatment
Many eye symptoms in patients already receiving therapy come from the treatment or from its effect on immunity rather than from the leukemia itself:
- Infections: during periods of low neutrophils, fungal infections and viral infections such as cytomegalovirus (CMV) retinitis can threaten sight.
- Chemotherapy effects: high-dose cytarabine can irritate the surface of the eye (keratoconjunctivitis), which is why steroid eye drops are routinely given alongside it.
- Steroid side effects: long courses of corticosteroids, common in ALL treatment, can cause cataracts and raise eye pressure.
- Graft-versus-host disease: after a stem cell transplant, chronic GVHD often causes severe dry, gritty eyes.
- Radiation: cranial or total body irradiation can contribute to cataracts years later.
Diagnosis: Blood Tests and Eye Examination
Eye findings raise suspicion, but diagnosing leukemia relies on blood and marrow testing. A complete blood count may show a very high or low white count, anemia, and low platelets. A bone marrow biopsy confirms the diagnosis and establishes the leukemia type, while specific tests such as detecting the Philadelphia chromosome are used in diagnosing chronic myeloid leukemia.
On the eye side, an ophthalmologist will usually perform:
- A dilated fundus examination to view the retina and optic nerve.
- Slit-lamp examination of the front of the eye.
- Optical coherence tomography (OCT), a painless scan that shows retinal layers in cross-section.
- MRI of the brain and orbits if optic nerve or orbital involvement is suspected, often with a lumbar puncture to check the spinal fluid for leukemic cells.
Treatment and Coordinated Care
The foundation is treating the leukemia itself. Chemotherapy, targeted drugs such as tyrosine kinase inhibitors for CML, immunotherapy, and stem cell transplantation are chosen according to the type, as outlined in our guide to leukemia treatment strategies. As blood counts recover, many retinal findings resolve without specific eye treatment.
Some findings need targeted care. Optic nerve infiltration is treated urgently, often with radiation to the eye and optic nerve plus therapy directed at the central nervous system. Very high white counts causing leukostasis may need rapid cytoreduction. Platelet transfusions help control bleeding, and infections are treated with antiviral or antifungal medicines, sometimes injected directly into the eye. Close teamwork between the hematologist and ophthalmologist is essential.
When to See a Doctor
Anyone with leukemia, or with unexplained bruising, fatigue, and fevers, should seek urgent review for:
- Sudden blurred or lost vision in one or both eyes.
- New floaters, flashes, or a curtain across the vision.
- A painful red eye, especially with a fever during chemotherapy.
- A bulging eye, swelling around the eye, or new double vision.
Eye changes alongside general symptoms are among the signs of leukemia worth reporting promptly. Our leukemia hub covers the wider picture.
Frequently Asked Questions
Can an eye exam detect leukemia?
An eye exam cannot diagnose leukemia on its own, but findings such as multiple retinal hemorrhages or Roth spots can prompt an optometrist or ophthalmologist to order a blood count. Leukemia is then confirmed with blood and bone marrow tests.
Are retinal hemorrhages from leukemia permanent?
Most retinal hemorrhages clear as platelet and hemoglobin levels improve with treatment. Bleeding directly over the macula, the center of vision, can occasionally leave lasting blurring, which is why prompt eye review matters.
Which type of leukemia is most likely to affect the eyes?
Eye involvement is more common in acute leukemias, both AML and ALL, because counts change rapidly. Orbital masses are most associated with AML, while eye relapse is a recognized concern in ALL.
Should I have regular eye checks during leukemia treatment?
Many centers arrange a baseline eye exam at diagnosis and further checks if symptoms develop or if you receive long-term steroids or a transplant. Ask your team what schedule suits your treatment plan.
