Uses of Nevanac Eye Drop. Nevanac Eye Drop is used in the treatment of post-operative eye pain and inflammation.How Nevanac Eye Drop works. Nevanac eye drop is a non-steroidal anti-inflammatory drug (NSAID). It works by stopping the release of certain natural substances in the eye that are responsible for pain and inflammation (redness and swelling).How to use Nevanac Eye Drop. This medicine is for external use only.Take it in the dose and duration as advised by your doctor. Check the label for directions before use. Hold the dropper close to the eye/ear without touching it. Gently squeeze the dropper and place the medicine inside the lower eyelid or ear. Wipe off extra liquid.