Medical Oncologist
Drug side effects
Blurred Vision and Eye Problems — on Cancer Drugs
Eye symptoms are among the most common side effects of targeted therapies. Most are mild and manageable at home. A few need urgent review the same day.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- Very common — Dry eyes, irritation, and mild blurring occur frequently on EGFR inhibitors, BRAF inhibitors, and some immunotherapy drugs.
- Usually mild — Most eye symptoms do not affect your vision long-term and can be managed at home while treatment continues.
- A few are urgent — Sudden vision change, new floaters, flashes of light, or eye pain need the same-day call or emergency review.
- Always report them — Even mild eye symptoms should be mentioned at your next appointment so they can be monitored and documented.
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Eye problems — dry, irritated eyes, mild blurring, or watery eyes — are common on targeted therapy and some immunotherapy drugs. Most are mild and do not cause lasting harm. Sudden vision loss, new flashes of light, floaters, severe eye pain, or double vision need same-day urgent review, not your next appointment.
If a symptom below applies to you, do not wait for a callback. Call 1800-202-8726 or go to your nearest emergency department.
Are eye problems from targeted therapy dangerous?
Most eye symptoms on targeted therapy are uncomfortable rather than dangerous. Many of these drugs act on pathways that are also active in the cells of the eye surface and eyelid glands, so eye side effects are expected — not a sign something has gone wrong.
Dry, gritty, or mildly irritated eyes can usually be managed at home. Use preservative-free artificial tear drops regularly through the day. Wear sunglasses if light bothers your eyes. If your eyelids are puffy, a cool compress and sleeping with your head slightly elevated can help.
Avoid contact lenses while your eyes are inflamed or watering. Switch to glasses until symptoms settle, and ask your team before going back to lenses.
Mild symptoms that are stable — unchanged day on day — can wait for your next scheduled appointment. Anything that is new or worsening should not wait.
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Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
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Radiation Oncologist
Radiation Oncologist
Hematologist
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Dr. Mohammed Imran
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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How do you tell which eye symptoms need urgent review?
| Symptom | Manage at home | Call your team today | Go to emergency now |
|---|---|---|---|
| Dryness or grittiness | Yes — preservative-free artificial tears | Not improving after a few days, or getting worse | — |
| Mild blurring | Stable, unchanged — monitor | Any blurring that is new or worsening over hours or days | Sudden severe loss of vision |
| Watery or sticky eyes | Yes — common, monitor | Discharge, crusting, or spreading redness | — |
| Eyelid puffiness | Mild puffiness — cool compress, head slightly elevated at night | Severe swelling or pressure on the eye | — |
| Eye pain | Very mild ache — monitor briefly | Anything beyond a mild ache, especially with redness | Severe pain with any vision change |
| New floaters or flashes of light | — | — | Any new occurrence — go now |
| Double vision | — | Any new double vision — call immediately | — |
| Typically starts | Most eye symptoms appear in the first weeks of starting a drug, but can develop at any point during treatment — including months later | — | — |
When should you call your oncology team about your eyes?
**Call your team the same day if your vision has changed, if a symptom you already had has clearly worsened, or if you have any eye pain beyond a very mild ache.**
You do not need to wait for your next appointment to raise an eye concern. Your team can often advise by phone, and they may refer you to an ophthalmologist for a more detailed assessment.
Mention even mild symptoms at your next visit. Eye side effects are graded and documented as part of your treatment record, and patterns noticed early can be managed before they become a problem.
If you already see an ophthalmologist for a pre-existing eye condition, make sure both that doctor and your oncology team know about each other — they may need to coordinate.
More questions about eye problems on cancer treatment
Can I use eye drops from a pharmacy without asking my team first?
Preservative-free artificial tear drops are generally safe and are commonly recommended for dryness on targeted therapy — these are fine to use. However, eye drops containing vasoconstrictors (products marketed to 'get the red out'), antibiotic drops, or steroid drops should not be used without your team's advice. If you are unsure what a drop contains, photograph the label and send it to your team before using it. This is especially important for medicated drops, including antihistamine or steroid eye preparations available over the counter.
Will I need to see an ophthalmologist, or can my oncology team manage this?
For mild dryness or irritation, your oncology team can manage your symptoms directly and advise on drops and what to watch for. For symptoms that are worsening, not responding to drops, or where there is any concern about your vision, they will refer you to an ophthalmologist with experience in drug-related eye problems. Some targeted therapy drugs — particularly those that work on the BRAF pathway — can cause changes inside the eye that need specialist equipment to assess properly. Your team will tell you if that applies to your treatment.
Will eye problems mean my cancer treatment has to stop?
Not necessarily. Mild eye symptoms are usually managed while treatment continues, sometimes with a short break or a dose adjustment rather than stopping altogether. More significant changes — particularly those affecting vision — may require treatment to be paused while the problem is treated, and your oncologist will weigh that against how well the drug is working for you. Reporting symptoms early is what keeps the milder options available. A problem caught and managed at grade one is far less likely to require stopping treatment than one that has been left and worsened.
Why have my eyelashes grown longer since starting treatment?
Longer, thicker, or more curled eyelashes — a change called trichomegaly — is a recognised effect of EGFR inhibitor drugs. It happens because the same growth pathway the drug is blocking also regulates how hair follicles behave. The eyelashes themselves are not harmful, but they can sometimes curl inward and irritate the eye surface. An ophthalmologist or optician can trim them safely. Do not try to trim them yourself with scissors near the eye. Mention the change at your next appointment so it is documented in your record.
I had an eye condition before starting treatment. Does that increase my risk?
It may. Conditions such as glaucoma, macular degeneration, or a history of retinal problems can affect how well your eye tolerates additional stress from a cancer drug, and some drugs are used with particular caution in people with pre-existing eye disease. Tell your oncologist about any eye condition before treatment starts, and make sure your ophthalmologist knows you are on a targeted therapy. The two teams may need to coordinate, especially for drugs known to affect pressure inside the eye or the retina. If you were not asked about this before starting, raise it at your next visit.
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Side Effects - Symptom-Specific Deep Dives
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- Blood Clots and Stroke Risk on Targeted Therapy
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- High Blood Sugar on PI3K and mTOR Inhibitors
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- Low Platelets on PARP Inhibitors and TKIs
- Low White Cells and Infection Risk on Targeted Therapy
- Mouth Ulcers and Mucositis: Practical Relief
- Muscle Cramps and Joint Pain on Cancer Drugs
- Nausea and Vomiting on Oral Cancer Drugs
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- Paronychia and Nail Changes on Targeted Therapy
- Peripheral Neuropathy: Tingling and Numbness in Hands and Feet
- Protein in Urine (Proteinuria) During Treatment
- QT Prolongation: What It Means on Your ECG Report
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- Severe Rash With Fever or Blistering: A Medical Emergency
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- Swelling of Face, Legs and Around the Eyes
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- Weight Gain During Long-Term Targeted Therapy
- When Diarrhoea Becomes an Emergency: The Rule You Must Know
- Wound Healing Problems on Antiangiogenic Drugs
Daily Living & Adherence
- Can I Drink Alcohol on Targeted Therapy?
- Can I Drive While on Targeted Therapy?
- Can I Fast for Religious Reasons During Targeted Therapy?
- Can I Have Dental Treatment While on Targeted Therapy?
- Exercise During Targeted Therapy: How Much Is Safe?
- Haircuts, Waxing, Facials and Tattoos During Treatment
- How Should Family Members Handle Your Cancer Tablets Safely?
- I Accidentally Took a Double Dose: How Serious Is It?
- I Missed a Dose of My Targeted Therapy: What Should I Do?
- I Vomited Right After Taking My Tablet: Do I Repeat the Dose?
- Managing a Household Routine Around Your Dosing Schedule
- Pets, Gardening and Infection Precautions
- Running Out of Medicine: What to Do About Refills and Shortages
- Safe Disposal of Unused Cancer Medicines
- Sex and Intimacy While on Targeted Therapy: Safety Questions
- Sleep Problems on Targeted Therapy and What Actually Helps
- Smoking and Targeted Therapy: How It Changes Your Drug Levels
- Travelling With Cancer Tablets: Flights, Security and Storage
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- Not Passing Urine or Sudden Swelling All Over
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- What to Tell an ER Doctor Who Doesn't Know Your Cancer Drug
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- Antacids and Acidity Tablets Can Block Your Cancer Drug
- Anti-Nausea and Anti-Acidity Drugs That Prolong QT
- Anti-TB Treatment and Targeted Therapy: A Dangerous Combination
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- Contraceptive Pills and Hormone Medicines With Cancer Drugs
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- Grapefruit, Pomegranate and Starfruit: Why They're Banned on Many Cancer Drugs
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- How to Check Any New Medicine Against Your Cancer Drug
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- Protein Powders and Immunity Boosters: Helpful or Harmful?
- Statins and Cholesterol Medicines During Cancer Treatment
- The Complete Do-Not-Take List for Common Targeted Therapy Drugs
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Side Effects - General & Timeline
- Are Side Effects a Sign That the Drug Is Working?
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- Targeted Therapy Side Effects: The Complete List by Drug Class
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- When to Call Your Oncologist Immediately: The Red Flag List
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Common questions
Frequently asked questions
Is blurred vision on targeted therapy always serious?
Mild blurring that has been stable since you started a drug is usually a known side effect rather than an emergency. What matters most is whether your vision has changed recently, whether the blurring is worsening, and whether there is any pain, double vision, or loss of vision alongside it. Stable mild blurring can wait for your next appointment. Any blurring that is new, worsening, or accompanied by other symptoms should be reported the same day.
How quickly should I act if I notice new floaters or flashes of light?
The same day — go to an eye emergency department rather than waiting to call your oncology team first. New floaters, flashes of light, or a shadow appearing across part of your vision are signs that may indicate a retinal problem, and those need to be assessed by an ophthalmologist with specialist equipment. This applies whether you are on a cancer drug or not, but some targeted therapies carry a known association with retinal changes, which makes prompt assessment even more important.
Can I keep wearing contact lenses while on targeted therapy?
It is safer to switch to glasses while you have active eye symptoms such as dryness, redness, watering, or swelling. Contacts can worsen irritation, increase the risk of infection, and make it harder to use eye drops correctly. Once symptoms have fully settled, ask your team before going back to lenses — and when you do restart wearing them, tell your optician that you are on a targeted therapy so they can advise on lens type and cleaning routine.
What will happen when I call my team about an eye symptom?
Your team will ask when the symptom started, whether it has changed since you first noticed it, whether both eyes are affected, whether there is any pain, and whether your vision has altered. Based on your answers they may advise monitoring at home with a specific trigger to call back, ask you to come in the same day, or refer you directly to an ophthalmologist. If they are concerned about something urgent, they will direct you to eye emergency rather than a routine appointment.
Are some cancer drugs harder on the eyes than others?
Yes. EGFR inhibitors are particularly associated with dry eyes, conjunctivitis, and eyelash changes. BRAF and MEK inhibitors have a recognised association with uveitis and retinal changes. Some TKIs cause swelling around the eyelids. Immunotherapy drugs can occasionally cause uveitis or dry eyes as part of a broader immune reaction. Which side effects are most relevant to you depends on the specific drug in your regimen — your team can tell you what to watch for.