SEM Autofocusing and Astigmatism Correction using FFT and GPGPU techniques

Autofocusing and Astigmatism Correction in the Scanning Electron Microscope

This work investigates both the theoretical and practical aspects of autofocusing and astigmatism correction in the scanning electron microscope. A general framework is used to divide the problem into four primary areas of concern: noise reduction, regions of interest, sharpness measures, and maximum sharpness search algorithms. Each of these areas is investigated in detail and several novel co...

Correction of high astigmatism using LASIK and arcuate keratotomy

We describe the case of a 47-year-old man who came to our center to be assessed for refractive surgery in 2007. The initial scan (instillation of 3 drops of cyclopentolate 1%) revealed a corrected distance visual acuity of 20/60 with +0.50 –9.50 × 10° in OD and 20/60 with +1.25 –9.50 × 165° in OS. We performed laser in situ keratomileusis (LASIK) in both eyes using a bicylindrical approach afte...

synthesis of amido alkylnaphthols using nano-magnetic particles and surfactants

we used dbsa and nano-magnetic for the synthesis of amido alkylnaphtols.

Femtosecond Laser-Assisted Astigmatism Correction

Successful Surgical Correction of Astigmatism using Customized Ablation Photorefractive Keratectomy

The aim of this study was to determine the change in the degree of astigmatism in patients treated with customized ablation photorefractive keratectomy (PRK). This is a cross-sectional study that involved 92 otherwise healthy subjects with regular and irregular astigmatism ≥ 1.25 D (mean age: 39.09 ± 7.72 years; range: 20-59 years). All study subjects were treated with customized ablation PRK u...