Using InterWave aberrometry to measure and improve the quality of vision in LASIK surgery.

Objective: To compare visual outcomes in eyes undergoing aberrometry-guided (InterWave) LASIK with those in eyes undergoing standard LASIK treatment based upon refractive measures.

Design: Single-center, comparative, interventional, consecutive case series.

Participants: Four hundred two consecutive eyes undergoing LASIK were analyzed retrospectively.

Wavefront aberrations from corneal ectasia after laser in situ keratomileusis demonstrated by InterWave aberrometry.

Purpose: To report a case of corneal ectasia after laser in situ keratomileusis (LASIK). The patient presented with minimal alterations in manifest refraction but had obvious distortions in the wavefront error of the eye, as demonstrated by InterWave aberrometry.

Methods: Retrospective case report and literature review.

SSR (spatially resolved refractometer): a null-seeking aberrometer.

The spatially resolved refractometer is an aberrometer used to measure the wave-front aberrations of the human eye. In its original form and the new configuration that we report, it uses the patient's perception in a psychophysical task to evaluate the wave-front errors at a variable number of loci (typically 40 or 160) across the cornea. This configuration includes pupil tracking and the ability to choose the measurement loci in software.

Observation of spectral broadening caused by self-phase modulation in highly multimode optical fiber.

We observed spectral broadening caused by self-phase modulation in 400- and 600-microm core diameter fibers using amplified, Q-switched, Nd:YAG laser pulses with peak powers to 150 kW. The degree of spectral broadening was not dependent linearly on the fiber length as in single-mode fibers because of the more complicated modal evolution in highly multimode fiber. Furthermore, even slight stress near the input end of the fiber reduced the observed broadening.