Some unintended side effects associated with eye drops include blurred vision and increased sensitivity to light, according to Drugs.com. These side effects do not necessarily require attention from a doctor or other medical specialist. Many of these side effects lessen over time without any action required by the patient.
Other mild side effects include eye redness, discomfort of the eye and irritation from the use of eye drops, explains Drugs.com. Some users experience swelling of the eyelids or watering of the eyes while using lubricating eye drops. A final side effect is stickiness found in the eyelashes or matting of the eyelashes.