Cyclotorsion measurement in laser refractive surgery

Laser refractive eye surgery.

Overview of laser refractive surgery.

Since approval of the use of the excimer laser in 1995 to reshape the cornea, significant developments in the correction of refractive errors such as myopia, hyperopia, and astigmatism have been achieved. Combined with other advanced ophthalmological instruments (e.g. anterior segment imaging systems, the femtosecond laser, wavefront-guided customized ablation) and the knowledge accumulated con...

Topography-guided laser refractive surgery.

PURPOSE OF REVIEW Topography-guided laser refractive surgery regularizes the front corneal surface irregularities to achieve the desired refractive outcome. This is particularly applicable in highly aberrated corneas, where wavefront aberrometry is often not possible. This article aims to review the recently published results of topography-guided ablations in normal regular corneas, highly aber...

Minimising residual aberration in the presence of cyclotorsion uncertainty in refractive surgery

METHODS: Assuming that cyclotorsion error can be estimated and compensated for with a certain level of uncertainty, we formulate a function to modify the wavefront error in order to minimize the residual aberration magnitudes due to cyclotorsion measurement uncertainty. A modal optimum nomogram factor is computed for minimization of the residual aberration for each Zernike mode. We also calcula...

infectious keratitis following excimer laser refractive surgery

infectious keratitis occurs rarely after laser refractive surgery, however the high volume of these procedures and young patient age render the prevention, diagnosis and treatment of this complication of utmost importance. early onset infectious keratitis is usually caused by gram positive bacteria while late onset cases are due to other microorganisms such as atypical mycobacteria, nocardia as...