Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

An Outcomes Study Comparing the Intralase FS 60 to the Intralase iFS When Performing LASIK Surgery for Nearsightedness

This study is ongoing, but not recruiting participants.
Information provided by (Responsible Party):
Edward E. Manche, Stanford University Identifier:
First received: June 1, 2011
Last updated: April 12, 2016
Last verified: April 2016
The purpose of the study is to compare the results of LASIK surgery when using two versions of a femtosecond laser in patients with nearsightedness with and without astigmatism.

Condition Intervention
Procedure: LASIK with the iFS femtosecond laser

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Prospective
Official Title: A Prospective Randomized Comparison of Fellow Eyes Undergoing LASIK With the Intralase FS 60 Versus the Intralase IFS

Further study details as provided by Stanford University:

Primary Outcome Measures:
  • Changes in Best Spectacle Corrected Visual Acuity [ Time Frame: One year ]
  • Changes in 5% low contrast best corrected visual acuity [ Time Frame: One year ]
  • Changes in corneal sensation [ Time Frame: One year ]
  • Uncorrected Visual Acuity [ Time Frame: One year ]
  • Stability of refractive outcome [ Time Frame: One year ]
  • Changes in 25% low contrast best corrected visual acuity [ Time Frame: One year ]

Secondary Outcome Measures:
  • Subjective Questionnaire [ Time Frame: 1 yr ]

Estimated Enrollment: 60
Study Start Date: April 2011
Estimated Study Completion Date: December 2017
Estimated Primary Completion Date: December 2017 (Final data collection date for primary outcome measure)
Intervention Details:
    Procedure: LASIK with the iFS femtosecond laser
    Patients will undergo bilateral simultaneous LASIK surgery for myopia. One eye will have a LASIK flap created with the Intralase FS60 and the fellow eye will have a LASIK flap created with the Intralase iFS. Both eyes will undergo wavefront-guided LASIK surgery with the Visx CustomVue excimer laser.
Detailed Description:
The patients will have a comprehensive eye examination once they express an interest in the study. This includes a slit lamp examination of the front of the eye and a dilated fundoscopic examination of the back of the eye. If there is any pathology noted that would exclude the patient from the study, then we will inform the patient and make an appropriate referral. if the patient is deemed appropriate for the study after a comprehensive examination included computerized videokeratography, then they can be enrolled. The patient will undergo bilateral simultaneous eye surgery. Which eye is treated with the Intralase FS 60 and which eye is treated with Intralase IFS will be randomized so there is a 50% chance for either eye to receive one treatment. The patients will be seen on the day of surgery, post op day one, one month, three months, six months and one year. The patient will receive topical antibiotics in each eye for one week following the procedure. The patient will receive pred forte 1% ophthalmic drops for one week after treatment. The patient will also receive vigamox ophthalmic drops for four days after treatment. All of this is within the usual and customary standard of care for the treatment of patients undergoing LASIK surgery.

Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
Subjects age 21 and older with healthy eyes. Nearsightedness between -0.25 diopters and -7.00 diopters with or without astigmatism of up to 3.00 diopters.

Inclusion Criteria:

  • Subjects age 21 and older with healthy eyes.
  • Nearsightedness between -0.25 diopters and -7.00 diopters with or without astigmatism of up to 3.00 diopters.

Exclusion Criteria:

  • Subjects under the age of 21.
  • Patients with excessively thin corneas.
  • Patients with topographic evidence of keratoconus.
  • Patients with ectactic eye disorders.
  • Patients with autoimmune diseases.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01365728

United States, California
Stanford University School of Medicine
Stanford, California, United States, 94305
Sponsors and Collaborators
Stanford University
Principal Investigator: Edward E. Manche Stanford University
  More Information

Responsible Party: Edward E. Manche, Professor of Ophthalmology, Stanford University Identifier: NCT01365728     History of Changes
Other Study ID Numbers: SU-05212011-7804
Stanford IRB Protocol # 21250
Study First Received: June 1, 2011
Last Updated: April 12, 2016

Keywords provided by Stanford University:
Femtosecond Laser
Wavefront-guided LASIK

Additional relevant MeSH terms:
Refractive Errors
Eye Diseases processed this record on April 27, 2017