Carboxymethylcellulose Sodium Lubricant Eye Drops 0.5% w/v. For the temporary relief of burning, irritation, and discomfort due to the dryness of the eye, or due to exposure to wind, sun, etc. Carboxymethylcellulose Sodium Lubricant Eye Drops 0.5% w/v may be used as a protectant against further irritation. This medication is used to relieve dry, irritated eyes. Common causes for dry eyes include wind, sun, heating/air conditioning, computer use/reading, and certain medications.