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Effect of Preoperative Pupil Size on Quality of Vision After Wavefront-Guided LASIK
Not Recruiting
Trial ID: NCT00889941
Purpose
The purpose of this study is to evaluate whether the size of the pupil has an effect on
quality of vision in patients undergoing LASIK surgery.
Official Title
Effect of Preoperative Pupil Size on Quality of Vision After Wavefront-Guided LASIK
Stanford Investigator(s)
Edward Manche, MD
Professor of Ophthalmology
Eligibility
Inclusion Criteria:
1. no more than 6.00 D of spherical myopia
2. no more than 3.00 D of refractive astigmatism
3. a stable refraction (less than 0.50D per year of sphere or cylinder)
4. a corneal diameter of less than 11.0 mm to allow for suction ring fixation
5. discontinuation of soft contact wear at least 7 days prior to preoperative evaluation
6. visual acuity correctable to at least 20/20
7. age older than 21 years
8. ability to participate in follow-up examinations for 12 months after LASIK surgery
Exclusion Criteria:
1. use of rigid gas permeable contact lens
2. severe dry eye symptoms
3. severe blepharitis
4. anterior segment abnormalities (i.e. cataracts, corneal scarring, or
neovascularization within 1 mm of intended ablation zone)
5. recurrent corneal erosion
6. severe basement membrane disease
7. progressive or unstable myopia or keratoconus
8. unstable corneal mires on central keratometry
9. corneal thickness in which LASIK procedure would result in less than 250 microns of
remaining posterior corneal thickness below the flap postoperatively
10. baseline standard manifest refraction of more than 0.75 D in sphere power
11. or a difference of greater than 0.50 D in cylinder power compared with baseline
standard cycloplegic refraction
12. a baseline standard cycloplegic refraction differing more than 0.75 in sphere, 0.50 D
in cylinder
13. have a different type of astigmatism (i.e. with-the-rule) when the cylinder is greater
than 0.50D compared to baseline standard cycloplegic refraction
14. preoperative assessment of ocular topography and/or aberrations indicates that either
eye is not suitable candidate for LASIK vision correction procedure (i.e. forme fruste
keratoconus
15. corneal warpage, or pellucid marginal degeneration)
16. previous intraocular or corneal surgery
17. history of herpes zoster or simplex keratitis
18. patients on systemic corticosteroid or immunosuppressive therapy
19. immunocompromised subjects or clinically significant atopic disease
20. connective tissue disease
21. diabetes
22. steroid responder
23. macular pathology
24. pregnant or lactating patients
25. patients with sensitivity to planned study concomitant medications
26. patients participating in another ophthalmic drug or device clinical trial
Intervention(s):
procedure: LASIK
Not Recruiting
Contact Information
Stanford University
School of Medicine
300 Pasteur Drive
Stanford,
CA
94305
Edward Manche
650498702