Contact Allergy, Neuropathic Pain
Conditions
Keywords
Contact Lens Discomfort
Brief summary
To find out if the use of an intranasal tear neurostimulator (ITN), may be useful in decreasing the pain symptoms felt by patients who experience contact lens discomfort.
Interventions
The ITN delivers small electrical currents to the inner cavity of the nose, gently activating nerves that stimulate the body's natural tear production system. Those in the ITN active arm will receive the active tips which contain the current from the base to the nasociliary nerve. Those in the ITN sham arm will receive tips without the current.
Sponsors
CooperVision, Inc.
Tufts Medical Center
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Subject)
Eligibility
Sex/Gender
ALL
Age
21 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* At least 21 years of age at screening visit * Ocular Surface Disease Index (OSDI) score of less than 12 (without contact lens wear) * Contact Lens Dry Eye Questionnaire (CLDEQ)-8 score of greater than 12.18 * Regular contact lens wearer who wears them less than 6 hours per day due to discomfort * The presence of at least one microneuroma on in vivo confocal microscopy * Self-reported good compliance with healthy contact lens regimen (replace contact lenses per manufacturer's recommendations, use of multipurpose or hydrogen peroxide contact lens solution nightly) * Have had an eye exam within the last two years that included dispense of a contact lens prescription * Proparacaine drops relieve at least 75% of ocular symptoms to ensure that patients do not have centralized neuropathic corneal pain * If a soft lens wearer, use a contact lens that was released within the last 15 years
Exclusion criteria
* Use of topical drops other than artificial tear substitutes * Ocular surgery or other ocular disease within 3 months prior to study enrollment * Concurrent ocular disease that may impact results * Have dry eye (as defined by 2 or more of the parameters below) * Schirmer's wetting test \< 10mm * TBUT \<7sec * NEI scale corneal staining of 4 out of 15 at the time of enrollment * Improper CL fit * No microneuroma by in vivo confocal microscopy * Overnight wear within 1 month of screening visit * Use of colored or cosmetic lenses * Contra-indication to ITN * Chronic or recurrent epistaxis, coagulation disorders. * Nasal or sinus surgery or significant trauma to the nose. * Cardiac demand pacemaker, implanted defibrillator, or other implanted electronic device in the head or neck. * Chronic or recurrent nosebleeds * Bleeding disorder * Known hypersensitivity (allergy) to the hydrogel material * Disabling arthritis, neuropathy, or limited motor coordination affecting self-handling of the device. * History of migraines * Under 21 years of age
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| To evaluate the decrease in microneuromas by means of in vivo confocal microscopy (IVCM) among CLD subjects following treatment | 3 months |
| To measure the changes in the level of discomfort/pain after instillation of hyperosmolarity drops among CLD subjects following treatment | 3 months |
| To measure changes in Contact Lens Dry Eye Questionnaire (CLDEQ)-8 among CLD subjects using ITN. | 3 months |
Secondary
| Measure | Time frame |
|---|---|
| To access the corneal dendritic cells (DC) density by means of IVCM among CLD subjects before and after treatment. | 3 months |
| To evaluate the change in wearing time and comfortable wearing time from baseline to the final visit. | 3 months |
Countries
United States
Outcome results
None listed