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Effects of Cataract Extraction Surgery and Limbal Relaxing Incision on Corneal Sensation and Dry Eye

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ClinicalTrials.gov Identifier: NCT01161771
Recruitment Status : Completed
First Posted : July 14, 2010
Results First Posted : July 26, 2012
Last Update Posted : July 26, 2012
Sponsor:
Information provided by (Responsible Party):
Allergan

Study Description
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Brief Summary:
This is a multicenter evaluation of the effects of the cataract extraction and limbal relaxing incisions (LRI) on corneal sensation and dry eye signs and symptoms.

Condition or disease Intervention/treatment
Dry Eye Procedure: Cataract Surgery and Limbal relaxing incision

Study Design
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Study Type : Observational
Actual Enrollment : 32 participants
Observational Model: Case-Only
Time Perspective: Prospective
Study Start Date : May 2010
Actual Primary Completion Date : December 2010
Actual Study Completion Date : December 2010

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Cataract

Groups and Cohorts
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Group/Cohort Intervention/treatment
Patients with cataract and corneal astigmatism
Patients with cataract(s) and corneal astigmatism who received surgical treatment (cataract extraction and limbal-relaxing incisions)
 Procedure: Cataract Surgery and Limbal relaxing incision
Cataract extraction and limbal-relaxing incisions


Outcome Measures
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Primary Outcome Measures :
  1. The Percentage of Subjects at Month 3 With Corneal Sensitivity < 50 Millimeters (mm) at Any of the Locations Measured [ Time Frame: Month 3 ]
    The percentage of subjects at month 3 with corneal sensitivity < 50 mm at any of the locations measured. Corneal sensitivity is evaluated by using a nylon filament to measure the capability of the cornea (clear front portion of the eye) to respond to touch. The longest filament length at which a minimum of the 3 out of 5 stimulus applications produce a positive response from the subject was the corneal touch threshold (sensitivity). Measurements were taken at 5 different locations in each cornea.


Secondary Outcome Measures :
  1. Change From Baseline in Ocular Surface Disease Index (OSDI) Total Score at Month 3 [ Time Frame: Baseline, Month 3 ]
    Change from baseline in OSDI total score at month 3. The OSDI is a 12-question survey for subjects to document their dry eye disease symptoms. The OSDI consists of a 5-point scale (0=none of the time and 4 = all of the time), with higher scores representing greater disability. The scores are totaled over the 12 questions and converted to a score of 0-100 (0=no disability and 100=complete disability). A negative number change from baseline represents an improvement.

  2. Change From Baseline in Corneal Staining at Month 3 [ Time Frame: Baseline, Month 3 ]
    Change from baseline in corneal staining at month 3. The cornea is the transparent front part of the eye which covers the iris and pupil. Corneal staining following administration of fluorescein dye in the eye is graded using a 6-point scale (0= no staining, 5 = severe staining) over 5 areas of the clear central part of the eye for a minimum score of 0 and a maximum score of 25. The higher the grade score, the worse the dry eye condition. A positive number change from baseline represents an increase in corneal staining (worsening of dry eye).

  3. Change From Baseline in Conjunctival Staining at Month 3 [ Time Frame: Baseline, Month 3 ]
    Change from baseline in conjunctival staining severity score at month 3. The conjunctiva is the clear membrane covering the white surface of the eye. Conjunctival staining following ocular administration of lissamine green dye was graded using a 6-point scale (0= no staining, 5= severe staining) over 6 areas of the white part of the eye for a minimum score of 0 and a maximum score of 30. The higher the score, the worse the dry eye condition. A negative number change from baseline represents a decrease in the severity of conjunctival staining (improvement)

  4. Change From Baseline in Tear Break-Up Time at Month 3 [ Time Frame: Baseline, Month 3 ]
    Change from baseline in tear break-up time (TBUT) at month 3. TBUT is the time required for dry spots to appear on the surface of the eye after blinking. The longer it takes, the more stable the tear film. A short TBUT is a sign of poor tear film. A negative number change from baseline indicates a decrease in TBUT (worsening).

  5. Change From Baseline in Schirmer's Test at Month 3 [ Time Frame: Baseline, Month 3 ]
    Change from baseline in Schirmer's Test result at month 3. The Schirmer's Test measures the rate of the secretion of tears produced by the eye over 5 minutes. The results indicate the presence of dry eye (Normal = greater than or equal to 10 millimeters (mm) of tears, Dry Eye = less than 10 mm of tears). The smaller the number, the more severe the dry eye. A positive number change from baseline indicates an increase in tears (improvement).


Eligibility Criteria
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Ages Eligible for Study:   50 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patients undergoing cataract extraction and limbal relaxing incision
Criteria

Inclusion Criteria:

  • Patient scheduled to undergo clear corneal cataract extraction with planned limbal relaxing incision for correction of a corneal astigmatism

Exclusion Criteria:

  • Uncontrolled systemic disease
  • Have undergone refractive surgery or any surgery involving a limbal or corneal incision
  • Use of topical cyclosporine (Restasis) within three months of baseline/randomization visit
  • Temporary or permanent occlusion of the lacrimal puncta
Contacts and Locations
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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 ClinicalTrials.gov identifier (NCT number): NCT01161771


Locations
United States, New York
Long Island, New York, United States
Sponsors and Collaborators
Allergan
Investigators
Study Director: Medical Director Allergan
More Information
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Responsible Party: Allergan
ClinicalTrials.gov Identifier: NCT01161771     History of Changes
Other Study ID Numbers: MA-RES-09-004
First Posted: July 14, 2010    Key Record Dates
Results First Posted: July 26, 2012
Last Update Posted: July 26, 2012
Last Verified: July 2012

Additional relevant MeSH terms:
Keratoconjunctivitis Sicca
Dry Eye Syndromes
Keratoconjunctivitis
Conjunctivitis
Conjunctival Diseases
 Eye Diseases
Keratitis
Corneal Diseases
Lacrimal Apparatus Diseases