Prostaglandin analogs may cause changes in iris color and eyelid skin, growth of eyelashes , stinging, blurred vision , eye redness, itching, and burning. Beta blockers' side effects include low blood pressure , reduced pulse rate , fatigue , shortness of breath, and in rare occasions, reduced libido and depression . Alpha agonists can cause burning or stinging, fatigue, headache , drowsiness , dry mouth and nose , and also they have a higher likelihood of allergic reaction. Carbonic anhydrase inhibitors may cause stinging, burning, and eye discomfort. 
Cineraria Homeopathic Eye Drops for Clear Crystalline Lens: Traditional Homeopathic Medicine for Cataract.
Cineraria is the principle ingredient in cineraria maritima eye drops. Cineraria is the traditional homeopathic remedy most often recommended as eye drops for cataracts due to its capacity to clear and dissolve obstructing fibrils in the lens, and is gluten free. In India, it is thought to be the most valuable remedy for cataracts by healing the lens. Additional natural homeopathic ingredients are added to the formulation to support the healing process.
Cataracts are a condition which develops as the body, with age, has a harder time providing oxygen, nutrition, detoxification and antioxidants to the cells of the eye's lens. There are no blood vessels in the lens, so the body's task to provide these nutrients and defenders is a challenge. Contrary to past common practice of eye doctors to wait until the lens "ripens" and replace the clouded lens with an artificial lens, doctors now often recommend natural treatments supporting the capacity to maintain or even clear the crystalline lens.
Proper nutrition, exercise and multivitamin supplementation is also recommended.