The Visual Effect of an Investigational Artificial Tear in the Tear Layer.

Study Overview
=================
Brief Summary
-----------------
The purpose of this study is to investigate how the addition of a new artificial tear product when applied to the tear layer affects contrast sensitivity and optical aberrations over time. We will also determine if there are any adverse effects associated with drop instillation.

Detailed Description
-----------------
Artificial tears are applied to the eye to treat a variety of eye conditions. These conditions typically are associated with dry eyes and include tear film deficiency due to ocular or systemic disease, lid resurfacing problems, and contact lens wear. The artificial tears are used to alleviate the dry eye symptoms. The administration of an artificial tear to the eye can disrupt the tear layer and this disruption could then result in a decrease in contrast sensitivity.1 - 6 Temporal changes in tear film structure (e.g., drying of the tear layer) can distort the optical wavefront as it passes through the tear layer and subsequently reduce contrast sensitivity.1 Theoretically, any substance applied to the tear layer that alters its structure could affect contrast sensitivity. Previous work in our lab has demonstrated that Refresh Liquigel when applied to the tear layer of non-contact and contact lens wearing subjects can decrease contrast sensitivity.4, 5, 7 In this study, we propose to examine the effects of a new investigational artificial tear on contrast sensitivity and optical aberrations for up to 30 minutes after administration into the tear layer of normal and dry eye subjects. A questionnaire will also be used to determine the opinions of the subjects concerning this new artificial tear.

Official Title
-----------------
The Visual Effect of an Investigational Artificial Tear in the Tear Layer.

Conditions
-----------------
Dry Eye Disease

Intervention / Treatment
-----------------
* Drug: Optiva artificial tear by Allergan


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Thirty subjects free from ocular pathology will be chosen. Ten of the subjects will have a normal tear layer, ten will have a mild dry eye, and ten will have a moderate/severe dry eye. All subjects will be over the age of 18. Best corrected visual acuities will be at least 20/25 on a standard Snellen acuity chart at distance. Exclusion Criteria: Subjects will be excluded from this project if they have, or during the course of the experiment they develop, an allergy to the eye drops used in this project.

Ages Eligible for Study
-----------------
Minimum Age: 18 Years
Maximum Age: 40 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
Accepts Healthy Volunteers

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Supportive Care
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Single


Arms and Interventions

| Intervention/Treatment |
| --- |
|Drug: Optiva artificial tear by Allergan|nan|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Contrast sensitivity and optical aberrations before daily artificial tear use and at 1 and 2 weeks after daily use |  |  | 
| Dry eye questionnaire before and at 1 and 2 weeks after artificial tear use |  |  | 
| Slit lamp exam before and at 1 and 2 weeks after artificial tear use |  |  | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
contrast sensitivity