Why does my eye sting when I apply eye drops?

For individuals who work extensively with computers, symptoms such as dryness, soreness, and fatigue in the eyes are common. It is therefore advisable to keep artificial tears readily available and administer them promptly whenever discomfort arises—this helps restore clarity and comfort to the eyes. However, many people experience sharp, stinging pain rather than relief after using eye drops. What could be causing this?

Why Do Eye Drops Cause Stinging Pain?

Brief stinging is normal. Most people experience transient stinging immediately after instilling eye drops—this is considered normal. However, if the stinging persists for several minutes without subsiding and is accompanied by excessive tearing, it indicates an abnormal reaction.

Firstly, eye drops often contain ingredients such as pearl extract, borneol, and menthol, which produce a cooling, moistening sensation. Yet these substances are foreign to the ocular surface and require a brief adaptation period following instillation. Secondly, prolonged visual tasks lead to severe ocular dryness, increasing the eye’s sensitivity to external stimuli—hence, the more fatigued the eyes become, the more pronounced the stinging sensation tends to be upon drop application. Lastly, persistent stinging may indicate poor-quality eye drops or accidental contamination (e.g., dust entering the eye during administration). In such cases, rinse the eyes thoroughly with clean water to remove residual medication. If symptoms persist, seek prompt medical evaluation and treatment.

Correct Technique for Using Eye Drops

The scientifically recommended method involves gently pulling down the lower eyelid to expose the inferior conjunctival sac, then instilling the drops into this space—not directly onto the cornea or pupil. After instillation, gently close the eyes for several seconds. Additionally, lightly press the inner canthus (tear duct area) for about one minute to prevent the drops from draining through the nasolacrimal duct into the throat, thereby avoiding potential gastrointestinal irritation or other adverse effects.

1. Maintain Facial and Eyelid Hygiene

Avoid prolonged exposure to environments with poor air quality (or underwater conditions). When experiencing ocular discomfort, use prescribed eye drops as directed. For instance, chloramphenicol eye drops—typically 0.5 mL per eye—may be used for prophylactic protection, but dosage and frequency must strictly follow medical advice.

2. Practice Appropriate Visual Habits

Limit daily reading to no more than 8 hours (maintain upright posture, with books held approximately 40 cm from the eyes); limit television viewing to no more than 6 hours (sit upright, at least 5 meters from the screen); and restrict computer use to no more than 4 hours per day (sit upright, with the monitor positioned about 60 cm away). These guidelines promote healthy visual habits and help prevent ocular fatigue.

The above outlines the possible causes of stinging pain following eye drop use. We hope this information proves helpful to you.