Longitudinal Evaluation of Silicone Hydrogel (LASH) Study (LASH)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00727402
Recruitment Status : Completed
First Posted : August 4, 2008
Results First Posted : February 10, 2011
Last Update Posted : February 15, 2012
Information provided by (Responsible Party):
Loretta Szczotka-Flynn, Case Western Reserve University

Brief Summary:
The LASH Contact Lens Study is a prospective longitudinal study of silicone hydrogel (SH) contact lens wearers who sleep in their lenses for up to 29 consecutive nights (30 days) of continuous wear (CW), with monthly disposal. Up to 207 healthy nearsighted or farsighted patients with minimal or no astigmatism and no contraindications to CW lens use will be followed for 1 year. The primary outcome measure is the time to development of a corneal inflammatory event (CIE) as defined by slit lamp findings and patient symptoms. The main exposure of interest is corneal staining. Other key exploratory variables include bacterial contamination of study lenses and inflammatory mediators found in the tear film.

Condition or disease
Corneal Infiltrates

Study Type : Observational
Actual Enrollment : 205 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: The Longitudinal Evaluation of Silicone Hydrogel (LASH) Contact Lens Study
Study Start Date : October 2006
Actual Primary Completion Date : January 2009
Actual Study Completion Date : October 2009

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Eye Wear
U.S. FDA Resources

healthy patients fit into lotrafilcon A contact lenses for continuous wear

Primary Outcome Measures :
  1. Cumulative Incidence of Corneal Inflammatory Events [ Time Frame: annual ]
    Unadjusted cumulative incidence of corneal inflammatory events (CIE)using survival analysis methods. CIE are corneal infiltrates found in an otherwise clear cornea.

Biospecimen Retention:   Samples Without DNA
tear samples contact lenses bacteria isolated from contact lenses

Information from the National Library of Medicine

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Ages Eligible for Study:   15 Years and older   (Child, Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
study volunteers from academic community willing to wear extended wear contact lenses

Inclusion Criteria:

  1. The patient must be at least 15 years old. Children younger than this may not be mature enough for CW, and may have difficulty following the strict instructions required for CW or sitting through the exam procedures.
  2. The patient must have clear central corneas and free of any anterior segment disorders.
  3. The patient must have a spectacle corrected spherical refractive error between +5.50 D and -11.00 D with less than or equal to 1.00 D refractive cylinder. The parameters of the Ciba Vision Night and Day Lenses range from +6.00 to -10.00 D, and can correct the refractive range of this population. Monovision correction will be allowed only if the near eye does not exceed +6.00 D.
  4. The patient must be correctable to 20/25 or better with spectacles. Amblyopia will be excluded.
  5. Flat and steep corneal curvatures from SimK readings must be between 39.00 and 48.00 D. Corneal curvatures outside this range may be indicative of a disease state, and patients are not expected to comfortably wear either the 8.4 mm or 8.6 mm base curve available in Night and Day.(Dumbleton K 2002)
  6. Can be successfully fit with lotrafilcon A lenses at the enrollment visit.

Exclusion Criteria:

  1. The patient has worn rigid gas permeable lenses within the last 30 days or PMMA lenses within the last 3 months. These lenses can transiently alter the corneal shape and influence the fitting of soft lenses.
  2. The patient must not be a current extended wear user of lotrafilcon A lenses.
  3. The patient has an autoimmune disease (except for Hashimoto's Thyroiditis), immunocompromising disease, connective tissue disease, atopic dermatitis, insulin dependent diabetes, or any other systemic disease that in the investigator's opinion will affect ocular health.
  4. The patient is taking chronic systemic medications such as corticosteroids, antimetabolites, or non-steroidal anti-inflammatory agents or any other medication that in the investigator's opinion will affect ocular physiology.
  5. The patient has any ocular disease or condition such as aphakia, corneal dystrophies, corneal edema, external ocular infection, iritis, or had any anterior segment surgery.
  6. The patient is taking any ocular medications.
  7. The patient must have less than or equal to grade 2 on any of the slit lamp observations of: upper tarsal papilla, corneal staining, corneal neovascularization, conjunctival injection, and lid erythema or scales. Slit lamp findings higher than grade 2 bias the patient toward an adverse event and it may be difficult to detect true change related to CW.
  8. The patient is pregnant.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00727402

United States, Ohio
University Hospitals Case Medical Center
Cleveland, Ohio, United States, 44106
Sponsors and Collaborators
National Eye Institute (NEI)
Principal Investigator: Loretta B Szczotka-Flynn, OD, MS Case Western Reserve University

Publications of Results:
Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Loretta Szczotka-Flynn, Professor, Case Western Reserve University Identifier: NCT00727402     History of Changes
Other Study ID Numbers: K23EY015270-01 ( U.S. NIH Grant/Contract )
First Posted: August 4, 2008    Key Record Dates
Results First Posted: February 10, 2011
Last Update Posted: February 15, 2012
Last Verified: February 2012