Results 221 to 230 of about 45,093 (263)
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Large coherence length swept source for axial length measurement of the eye
Applied Optics, 2009We present and demonstrate a swept source with a large coherence length using a quasi-phase continuous tuning (QPCT) technique. QPCT is a method of minimizing the phase shift per round trip with respect to the tunable filter so that the resonance of lasing becomes high, resulting in high finesse of lasing during a rapid sweep.
Changho, Chong +4 more
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Ultrasound axial length measurement in biphakic eyes
Journal of Cataract and Refractive Surgery, 2003To determine the calculations to correct the error in ultrasound measurement of a phakic eye with a phakic intraocular lens (IOL) (biphakic eye) to increase the accuracy of IOL power calculation should cataract surgery become necessary. Mathematical derivations were performed to calculate the error caused by a phakic IOL while measuring an eye using an
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Axial eye-length measurement by wavelength-shift interferometry
Journal of the Optical Society of America A, 1993A simplified noncontact measuring technique for axial eye length was developed. According to this method, the wavelength shift of a single-mode laser-diode beam that is irradiated onto the eyeball causes a phase shift in the interference fringes of reflections from the retina and the cornea.
A, Sekine, I, Minegishi, H, Koizumi
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Calculating axial length in the aphakic and the pseudophakic eye
Journal of Cataract and Refractive Surgery, 1988The axial length of 149 eyes (84 pseudophakic and 65 aphakic) was calculated by refractive means and compared with the axial length determined by ultrasound. The mean error (+/- SD) between the measured and the calculated axial length (measured minus calculated) was 0.02 mm (+/- 0.51) and 0.13 mm (+/- 0.54) for the aphakic and the pseudophakic eyes ...
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Interocular Axial Length Difference in Eyes With Pediatric Cataracts
Journal of American Association for Pediatric Ophthalmology and Strabismus, 2005We sought to report interocular axial length difference (IALD) between the operated eye and fellow eye at the time of pediatric cataract surgery.A retrospective analysis of 171 cataractous (operated) eyes (mean patient age at surgery, 56.9 months; range, 0.2-230.0) was undertaken.
Garima, Lal +4 more
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Axial length and hyperopia in eyes with retinal vein occlusions
International Ophthalmology, 1997We performed a prospective study in order to elucidate the predisposing role of axial length and hyperopia in retinal vein occlusions. The study group comprised 39 patients with unilateral central retinal vein occlusion (CRVO), 50 patients with unilateral branch retinal vein occlusion (BRVO), 13 patients with unilateral hemispheric retinal vein ...
Kir, E +4 more
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Ultrasound velocities for axial eye length measurement
Journal of Cataract and Refractive Surgery, 1994Since 1974, I have used individual sound velocities for each eye condition encountered for axial length measurement. The calculation results in 1,555 M/sec for the average phakic eye. A slower speed of 1,549 M/sec was found for an extremely long (30 mm) eye and a higher speed of 1,561 M/sec was noted for an extremely short (20 mm) eye.
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Peripheral Chorioretinal Lesions and Axial Length of the Myopic Eye
American Journal of Ophthalmology, 1976A study of the retinal periphery of 1,437 predominantly myopic eyes revealed a statistically significant association of four types of peripheral chorioretinal degenerations with increased axial length of the eye. These were white without pressure, pigmentary degeneration, pavingstone degeneration, and lattice degeneration. There was a tendency for both
D B, Karlin, B J, Curtin
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Axial Eye Length Assessment in Silicone Oil-Filled Eyes
The Egyptian Journal of Hospital Medicine, 2017Purpose: to compare the reliability of axial eye length (AEL) measurement in silicone oil-filled phakic eyes by conventional B-scan ultrasonography through the eyelid, after a correcting factor,to partial coherence interferometry (PCI) measurement. Methods: a prospective and comparative study was performed at Al-Zahraa University Hospital clinic from (
Hayam S. Kamel, Mona N. Mansour
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Phacoemulsificatıon and Intraocular Lens Implantation in Eyes with Long Axial Length
Annals of Ophthalmology, 2007We evaluated the results of phacoemulsification and intraocular lens implantation in 414 eyes with long axial length and classified them according to axial length (AL): Group A: AL: 25-28 mm, Group B: AL >28 mm. Intraoperative maneuvers, pre- and postoperative photocoagulation for predisposing retinal lesions and retinal detachment rates were ...
Ozbek, ZEYNEP +4 more
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