Corneal vertex centration a benefit for hyperopic LASIK

Ophthalmology Times;  July 15, 2007 ;     700+ words ......MD, PhD San Diego-Centration on the corneal vertex or entrance pupil center are both safe...eye-tech-solutions), but use of the corneal vertex for ablation centration has the advantage...however, showed that centration on the corneal vertex induced a more prolate profile that...

Iris registration considers pupil centroid shift, cyclotorsion

Ophthalmology Times;  July 15, 2007 ;     700+ words ...Refractive outcomes Ignoring pupil centroid shift may lead to suboptimal results...patient satisfaction. Ignoring the pupil centroid shift can lead to suboptimal results...registration is very important because pupil centroid shift and the more common cyclotorsion...

Pupil centroid shift feature allows greater laser accuracy

Ophthalmology Times;  September 1, 2006 ;     700+ words ......Douglas D. Koch, MD San Francisco-The pupil centroid shift feature of the VISX S4 laser...Koch, MD. Lack of compensation for the pupil centroid shift induced significantly higher...Alcon and VISX lasers can adjust for pupil centroid shift. These are very interesting advances...

South Korean Inventors Develop Corneal Surface Mapping Method

US Fed News Service, Including US State News;  September 4, 2007 ;     349 words ......projecting one of the two beams to the corneal vertex of the eye, and capable of moving along the surface of the corneal vertex; a collimator for projecting...from the scanning mirror and the corneal vertex." The inventors were issued U...

Automatic iris registration proves valuable in clinical trial

Ophthalmology Times;  March 15, 2006 ;     628 words ......laser for treatment. In addition, the pupil centroid can also shift relative to the outer...compensate for cyclotorsional movement and pupil centroid shift. The Bogota Laser Refractive...compensate for cyclotorsional movement and pupil centroid shift occurring between wavefront ...

Iris registration ensures alignment of wavefront maps

Ophthalmology Times;  June 1, 2006 ;     700+ words ......Advanced Medical Optics [AMO] ) indicated that there is little variability in the measurement of the rotational change and pupil centroid shift between consecutive iris registration captures. There is, however, significant variability of the measurements in...

Fourier-based wavefront LASEK appears promising

Ophthalmology Times;  May 1, 2006 ;     700+ words ......McDonald, MD, FACS. The off-label procedures were performed with the S4 laser (VISX/AMO) with no automatic iris registration or pupil centroid shift compensation in eight postRK eyes of patients complaining bitterly about their vision and in a parallel-treated series...

Multifocal ablations for presbyopia explored

Ophthalmology Times;  March 15, 2007 ;     700+ words ......in excimer laser (VISX S4, Advanced Medical Optics [AMO]) was used to create the multifocal ablation pattern using the pupil centroid shift compensation and iris registration upgrades. The central zone is steepened tor near, and the peripheral area is targeted...

Laser enhancement important adjunct to multifocal IOL

Ophthalmology Times;  September 15, 2007 ;     700+ words ......surgery. A customized procedure performed with iris registration to compensate for cyclotorsional rotation of the eye and pupil centroid shift has the potential to result in more precise treatment of astigmatism compared with a conventional procedure. It may...

Evolution in wavefront-guided treatment yielding improved visual outcomes

Ophthalmology Times;  March 1, 2006 ;     700+ words ......ablation Proper positioning of the laser ablation pattern has also been improved by new technology that compensates for pupil centroid shift. This should eliminate the risk of a subtle decentered ablation caused by a shift in the pupil center in those lasers...

Study characterizes course of corneal healing after wavefront-guided PRK

Ophthalmology Times;  March 15, 2006 ;     583 words ......As an exception, residual coma did not resolve with lengthening follow-up. "The persistence of coma may be an effect of pupil centroid shift between the preoperative evaluation at the aberrometer and treatment in the illuminated operating room. However, that...

Better outcomes seen with addition of iris registration

Ophthalmology Times;  April 1, 2007 ;     700+ words ......showed the most significant improvement with iris registration technology, indicating more accurate axial alignment by the pupil centroid shift and more accurate radial alignment by the automatic torsional registration of the bitoric customized ablation," he...

Multifocal custom LASIK promising for hyperopic presbyopia

Ophthalmology Times;  July 15, 2005 ;     560 words ......ensure accurate registration of the ablation and proper placement of the pupil-size-dependent central zone relative to the pupil centroid," Dr. Kraff noted. Patients who are considered for study participation are being very carefully screened. Those who fall...

California, Nevada Inventors Develop Imaging Apparatus

US Fed News Service, Including US State News;  November 26, 2008 ;     289 words ......Pachymetry map is removed by correcting for the misalignment of the center of the Pachymetry map and the actual location of the corneal vertex." The patent has been assigned to Carl Zeiss Meditec Inc., Dublin, Calif. The inventors were issued U.S. Patent No. 7,452...

Product omission: EyeQuip

Ophthalmology Times;  August 15, 2000 ;     314 words ......capture system. The Keratron system features an infrared vertex detector. Users can move the unit toward the patient and the corneal vertex automatically triggers image capture. The Keratron topographer has no moving parts and its auto image capture system ensures...