Your eyes and cancer drugs

Cataracts is clouding of the lens of the eye which leads to slow loss of vision. If you have cataracts you might:

• have cloudy or blurry vision

• have trouble seeing in the dark– night driving may be difficult

• find colours appear faded or dull

• find lights appear to be too bright, or there may be a halo around lights

• have to change your glasses or contact lens prescription often

• have double vision, which gradually gets worse

Let your doctor or nurse know if you have any of these changes. If necessary, you can have the clouded lens removed and replaced with a false lens. You have this operation under local anaesthetic.

The following drugs can cause cataracts:

• some chemotherapy drugs

• some targeted cancer drugs

• long term steroid therapy

• tamoxifen - a hormone treatment

Some cancer drugs can make your eyes more sensitive to light. Doctors call this photophobia.

Treatments that might cause photophobia include:

• chemotherapy drugs, such as cytarabine

• immunotherapy drugs, such as ipilimumab

• targeted cancer drugs, such as crizotinib

• drugs used for photodynamic therapy treatment (PDT)

You may find that light hurts your eyes and is even painful.

Some people notice pain when they go from a dark to a light area. Most people are sensitive to light when they go outside during the daytime.

Tips for dealing with sensitivity to light 

• Wear dark glasses (sunglasses) to lower the amount of light going into your eyes.

• Shading your eyes with your hand, a cap or hat with a wide brim. You can also help by being under an umbrella or parasol.

• Avoid direct sunlight or bright indoor light.

• Inflammation of the eye caused by an infection can cause light sensitivity – treating the infection can help.

• Steroid eye drops may help – your doctor or nurse can prescribe these.

Some drugs can cause inflammation of the layer (membrane) that covers the white of your eye. Treatments that might cause this include some:

• chemotherapy drugs, such as cytarabine

• targeted cancer drugs, such as rituximab or erlotinib

• immunotherapy drugs, such as ipilimumab

Sometimes this layer can get infected. The inflammation or infection is called pink eye or conjunctivitis.

Symptoms of eye infections include:

• sore, red and inflamed eyes

• swollen eyelids

• scratchy, watery or itchy eyes

• pus or discharge coming from the eye

• eyes that are sensitive to light

Viruses or bacteria can cause infection. Infections are easy to get from dirty hands, flannels, cosmetics or towels.

Most types of viral infections go away on their own, with or without treatment. It can take up to a few weeks for symptoms to go completely.

You might need antibiotic eye drops if you have a bacterial infection.

Tips for dealing with eye infections

• Wash your hands often so you don’t spread the infection.

• Avoid touching or rubbing your eyes – if you must touch your eyes, wash your hands before and afterwards.

• Throw away any eye make-up you have used since having symptoms of the infection.

• Don’t wear contact lenses.

• Don’t share towels, flannels or sheets with anyone else.

• Use a separate towel or flannel for each eye if you have an infection in only one eye.

• Gently wash your eyelids with a warm, clean, moist cotton wool pad to remove any discharge.

• Your doctor or nurse may prescribe antihistamine pills or eye drops to relieve symptoms if the infection is viral.

• Your doctor or nurse will prescribe antibiotic eye drops or ointments if the infection is bacterial.

• Never share your medicines with anyone else and take medicines as directed.

• Don’t go swimming in chlorinated pools – chlorine in water can make sore eyes worse.

Some chemotherapy drugs, targeted cancer drugs or immunotherapy drugs can make your eyes very dry and sore. They might feel gritty, as though there is something in your eye.

This is because the drugs cause a reaction on the inside of your eyelids. Or you may not be making enough tears. Doctors call this kerato conjunctivitis sicca (pronounced keh-rah-toe con-junk-tiv-eye-tiss sick-uh).

You might have watery eyes but your eyes still feel dry and sore. This is due to a lack of an important chemical that moistens and lubricates the eyes.

Your doctor or nurse can prescribe artificial tears or ointments to reduce dryness. Avoid swimming in chlorinated water.

Some cancer drugs can cause watery eyes. This is also called excessive tearing or epiphora (pronounced ep-if-or-ah). It can be due to a blockage in the eye's drainage system caused by swelling of the nearby tissues. Or your eyes may be making too many tears.

Cancer drugs that can cause watery eyes include:

• chemotherapy drugs, such as capecitabine

• targeted cancer drugs, such as imatinib

• immunotherapy drugs, such as ipilimumab

Tips for dealing with watery eyes

• Your doctor or nurse might prescribe medicines to reduce swelling if the swelling is blocking the eye drainage system.

• Use warm compresses to help your eye to drain if your eye infection is causing swelling.

• Wear protective goggles and try to avoid irritants such as dust, pollen or animal hairs which can make the watering worse.

• Your doctor or nurse can prescribe ointments, eye drops or artificial tears if dry or irritated eyes are causing your eyes to water.

Some chemotherapy drugs, targeted cancer drugs and immunotherapies can make your eyelids inflamed and sore.

Your eyelids might also produce a crusty substance. Doctors call this blepharitis (pronounced blef-ah-rite-iss). You can have eye drops or ointment to soothe the inflammation.

Tips for dealing with swollen eyelids

• Use a warm, damp compress to loosen the crusting and relieve soreness.

• Use a washcloth with warm water to remove any crusts - use a separate cloth for each eye.

• Rinse your eyelids with warm water and pat dry with a clean, dry towel - use a separate towel for each eye.

Some chemotherapy and targeted cancer drugs can make your eyelashes grow in different directions than normal. This is called trichiasis. Eyelashes may also grow longer, thicker, darker and may curl. This is called trichomegaly.

This can happen during or after treatment but usually gets better after treatment. Let your doctor or nurse know if this happens. They can suggest artificial tears or other treatments. The eyelashes usually grow back but may fall out more than once.