Varenicline Solution Nasal Spray for the Treatment of Dry Eye Disease Following LASIK

The purpose of this study is to evaluate the use of a varenicline solution nasal spray (VNS) for reducing the signs and symptoms of dry eye following laser in situ keratomileusis (LASIK).Subjects electing to undergo LASIK were randomized to VNS (study group) or placebo/vehicle (control group) and initiated treatment with the nasal spray twice daily 28 days prior to surgery with continued treatment for 84 days following LASIK. After initiation of treatment, subjects were seen on the day of surgery and postoperatively on Days 1, 7, 28, 84 (3 months) and 168 (6 months). The primary outcome measure was the mean change in NEI-VFQ-25, a 25-item dry eye questionnaire, from baseline to 3 months. The second primary outcome measure was the mean change in corneal fluorescein staining. Secondary outcome measures included evaluation of tear break-up time, Schirmer testing, tear osmolarity and eye dryness score (EDS).Twenty subjects were enrolled in each group and successfully underwent LASIK. Both groups demonstrated an improvement in the National Eye Institute Visual Function Questionnaire (NEI-VFQ) at 3 months. The study group demonstrated improved corneal staining scores at months 1 and 3. Similarly, the study group demonstrated improvement in tear osmolarity scores versus the placebo group at the same time points. Although the study group was numerically greater than placebo for each time point for both corneal staining and tear osmolarity, the differences were not statistically significant for any primary or secondary outcome measures.VNS is a dry eye treatment option for patients following LASIK and may have potential benefit for patients hoping to avoid additional topical medications. The results were not statistically significant compared to placebo in this trial, and further investigation of the use of VNS following LASIK in a larger trial would be beneficial.Laser in situ keratomileusis (LASIK) is a very successful refractive surgery option for patients hoping to reduce or eliminate their need for spectacles. Signs and symptoms of dry eye disease are very common after LASIK owing to the transection of corneal nerves that occurs during the procedure, and many patients are advised to manage it with frequent instillation of artificial tears. This study evaluated the use of a varenicline solution nasal spray, a recently introduced pharmacologic option that stimulates natural tear production through activation of the trigeminal nerve pathway. This is the first study to evaluate the use of the varenicline solution nasal spray in patients after refractive surgery and demonstrates that it could represent a favorable, ocular surface-sparing option for patients to minimize the signs and symptoms of dry eye following LASIK, a procedure known to trigger symptoms of dry eye disease.