Technolas 217z Laser With Zyoptix Aspheric Algorithm Used for the LASIK Treatment of Myopia and Myopic Astigmatism.
A Prospective Trial to Evaluate the Safety and Effectiveness of the Bausch & Lomb Technolas® 217z Laser With Zyoptix® Aspheric Algorithm When Used for the LASIK Treatment of Myopia and Myopic Astigmatism
Přehled studie
Postavení
Postavení
Podmínky
Podmínky
Intervence / Léčba
Intervence / Léčba
Typ studie
Typ studie
Zápis (Aktuální)
Zápis
Fáze
Fáze
- Nelze použít
Kontakty a umístění
Studijní místa
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Ontario
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Toronto, Ontario, Kanada, M5X1C8
- Lasik MD, 130 King Street
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Kritéria účasti
Kritéria způsobilosti
Kritéria způsobilosti
Věk způsobilý ke studiu
Přijímá zdravé dobrovolníky
Pohlaví způsobilá ke studiu
Popis
Inclusion Criteria:
- Subjects who were of legal age (at least 18) and had full legal capacity to volunteer.
- Subjects must be willing to have both eyes treated with the laser.
- Subjects must have up to -12.00D of absolute spherical myopia (not spherical equivalent) with up to -6.00D of refractive astigmatism, with a spherical equivalent up to -15.00D as measured by manifest subjective refraction.
- Subjects who had less than 0.75 D of difference in the preoperative manifest spherical equivalent and cycloplegic spherical equivalent subjective refractions.
(Manifest subjective refractions adjusted for optical infinity were used.)
- High contrast, manifest best spectacle-corrected distance logMAR visual acuity correctable to at least 0.3 in both eyes, and must not differ between eyes by more than 1 line (5 letters).
- Contact lens wearers must have 2 Orbscan measurements and 2 manifest subjective refractions taken preoperatively at least 1 week apart.
- Contact lens wearers must have gas permeable lenses discontinued for at least 3 weeks and soft lenses discontinued for at least 2 weeks prior to the preoperative evaluation.
Exclusion
- Subjects with uncorrected visual acuity better than 20/40 (Snellen) or 0.3 logMAR
- Subjects who were immuno-compromised or had a diagnosis of connective tissue disease, clinically significant atopic disease, diabetes, autoimmune diseases and other acute or chronic illnesses that increased the risk to the subject or could have confounded the outcomes of this study.
- Subjects with uncontrolled glaucoma or glaucoma who were under treatment in the study eye or with ocular hypertension.
- Subjects who demonstrated evidence of retinal vascular disease.
- Subjects who have an ocular muscle disorder including strabismus or nystagmus, or other disorders that affected fixation.
- Subjects who were at risk for angle closure or who had a potentially occludable angle, as evidenced by a shallow anterior chamber on slit lamp exam, confirmed by gonioscopy as deemed necessary by the study Investigator.
- Subjects who had undergone previous intraocular or corneal surgery of any kind, including any type of excimer laser surgery for either refractive or therapeutic purposes.
- Subjects who were taking systemic medications likely to affect wound healing such as corticosteroids or anti-metabolites or any other medications that may increase the risk to the subject or confound the outcomes of this study.
- Subjects for whom the combination of their preoperative corneal thickness and the planned operative parameters for the LASIK procedure could have resulted in less than 250 microns of remaining posterior corneal thickness below the flap postoperatively.
Studijní plán
Jak je studie koncipována?
Detaily designu
- Primární účel: Léčba
- Přidělení: N/A
- Intervenční model: Přiřazení jedné skupiny
- Maskování: Žádné (otevřený štítek)
Počet zbraní
Zbraně a zásahy
Skupina účastníků / ArmSkupina účastníků / Arm |
Intervence / LéčbaIntervence / Léčba |
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Experimentální: Technolas 217z Excimer Laser
Bausch & Lomb Zyoptix Aspheric Algorithm for LASIK correction of myopia and myopic astigmatism.
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LASIK correction of myopia and myopic astigmatism
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Co je měření studie?
Primární výstupní opatření
Primární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
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Percentage of Eyes With Uncorrected High Contrast Distance Visual Acuity of 20/40 or Better
Časové okno: 3 months
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3 months
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Percentage of Eyes With Manifest Subjective Refraction (MRSE) Within ± 1.00 Diopter (D) and 0.50 D of Emmetropia
Časové okno: 3 months
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Manifest refractions (eyeglass prescriptions) have three components: sphere, cylinder, and axis.
Sphere and cylinder are both expressed in diopters, which is a continuous measure of the focusing power needed to make the image sharp on the retina.
Manifest refraction spherical equivalent (MRSE) is equal to sphere + ½ x cylinder.
It is expressed in diopters (D).
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3 months
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Preservation of Manifest Best Corrected High Contrast Distance Visual Acuity
Časové okno: Baseline, 3 months
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Mean change in best-corrected high contrast distance visual acuity.
Corrected means spectacle corrected.
Visual acuity (VA) was reported as letters read correctly, and the letters read were converted to logarithm of the minimum angle of resolution (logMAR) acuity.
The participant read rows of letters on a standard LogMAR chart until the participant misses 3 letters on a row with 5 letters.
The total number of correct letters were recorded.
A decrease in the number of correct letters indicates a decrease in visual acuity.
Acuity was averaged across visits.
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Baseline, 3 months
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Percentage of Eyes With Manifest Best-corrected Distance Photopic Visual Acuity Decrease of 2 or More Lines
Časové okno: 3 months
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3 months
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Percentage of Eyes With > 2.00 Diopter of Induced Postoperative Refractive Cylinder
Časové okno: 3 months
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Manifest refractions (eyeglass prescriptions) have three components: sphere, cylinder, and axis.
Sphere and cylinder are both expressed in diopters, which is a continuous measure of the focusing power needed to make the image sharp on the retina.
Manifest refraction spherical equivalent (MRSE) is equal to sphere + ½ x cylinder.
It is expressed in diopters (D).
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3 months
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Percentage of Eyes That Had High Contrast Best Spectacle Corrected Visual Acuity (HCBSCVA) of 20/20 or Better at Baseline Had a Visual Outcome Worse Than 20/40 at 3 Months
Časové okno: 3 months
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Corrected means spectacle corrected.
Visual acuity (VA) was reported as letters read correctly, and the letters read were converted to logarithm of the minimum angle of resolution (logMAR) acuity.
The participant read rows of letters on a standard LogMAR chart until the participant misses 3 letters on a row with 5 letters.
The total number of correct letters were recorded.
A decrease in the number of correct letters indicates a decrease in visual acuity.
Acuity was averaged across visits.
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3 months
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Sekundární výstupní opatření
Sekundární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
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Percentage Change From Baseline in Higher Order Aberrations.
Časové okno: Baseline, 3 months
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The aberrations in the eye's optical system were measured over the entire pupil by the Bausch & Lomb Zywave II WaveFront Aberrometer, a Hartmann-Shack type device.
The pupil should have been at least 6 mm in diameter using 2.5% phenylephrine as a dilating agent to maximize the pupil diameter and hence the amount of wavefront information collected by the Zywave II.
The wavefront data was then fitted with Zernike polynomials representing the 2nd, 3rd, 4th and 5th order Zernike terms.
These terms represent the wavefront aberration of the eye.
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Baseline, 3 months
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Spolupracovníci a vyšetřovatelé
Sponzor
Sponzor
Vyšetřovatelé
Vyšetřovatelé
- Vrchní vyšetřovatel: Mark Cohen, MD, Lasik MD
Termíny studijních záznamů
Hlavní termíny studia
Začátek studia
Začátek studia
Primární dokončení (Aktuální)
Primární dokončení
Dokončení studie (Aktuální)
Dokončení studie
Termíny zápisu do studia
První předloženo
První předloženo
První předloženo, které splnilo kritéria kontroly kvality
První předloženo, které splnilo kritéria kontroly kvality
První zveřejněno (Odhad)
První zveřejněno
Aktualizace studijních záznamů
Poslední zveřejněná aktualizace (Aktuální)
Poslední zveřejněná aktualizace
Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality
Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality
Naposledy ověřeno
Naposledy ověřeno
Více informací
Termíny související s touto studií
Další relevantní podmínky MeSH
Další identifikační čísla studie
Další identifikační čísla studie
- 564
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