Anterior segment changes produced in response to long-term overnight orthokeratology.

Purpose: To evaluate the effect of overnight orthokeratology (OK) on anterior chamber depth (ACD), posterior radius of corneal curvature (PRCC) and axial length (AL) over one year.

Methods: In this prospective longitudinal study, measurements were made in 34 right eyes of 34 subjects at baseline, 15 days, 1 and 12 months after starting OK treatment. ACD and PRCC measurements were obtained using a Pentacam system and AL was measured using an IOL-Master.

Recovery evaluation of induced changes in higher order aberrations from the anterior surface of the cornea for different pupil sizes after cessation of corneal refractive therapy.

Purpose: To assess corneal aberration changes induced by corneal refractive therapy (CRT) for different pupil sizes and to examine the recovery after cessation of contact lens wear.

Methods: A single-center, prospective, and longitudinal study was performed. Thirty-four subjects who underwent CRT for 1 year were included.

Long-term changes in corneal morphology induced by overnight orthokeratology.

Purpose: To assess long-term morphological and biometric corneal changes produced by overnight orthokeratology and to examine their recovery after cessation of contact lens wear.

Methods: Prospective, single-center, longitudinal trial. Fifteen right eyes with low to moderate myopia underwent overnight orthokeratology for 1 year.

Straylight and contrast sensitivity after corneal refractive therapy.

Purpose: To compare intraocular straylight and contrast sensitivity determined before corneal refractive therapy and after 15 days and 1 month of treatment.

Methods: A single-center, prospective, and longitudinal study was performed in 30 subjects undergoing corneal refractive therapy. In each subject, high-contrast visual acuity (HCVA), low-contrast visual acuity (LCVA), straylight, and contrast sensitivity were determined at baseline and after 15 days and 1 month after the treatment.

Short-term effects of overnight orthokeratology on corneal cell morphology and corneal thickness.

Purpose: To examine the morphological and biometric corneal changes produced over periods of 15 days and 1 month after overnight orthokeratology (OK).

Methods: Prospective, single-center, longitudinal trial. Twenty-seven right eyes of 27 subjects (group 1) with low to moderate myopia wore OK lenses for 1 month.

Intraocular straylight and contrast sensitivity (1/2) and 6 months after laser in situ keratomileusis.

Objectives: To compare intraocular straylight and contrast sensitivity determined before and 15 days and 6 months after laser keratomileusis.

Methods: A single-centre, prospective, longitudinal randomized trial was performed on 20 subjects undergoing refractive surgery. In each subject, best spectacle-corrected visual acuity (BSCVA) and straylight and contrast sensitivity were determined preoperatively (on the day of refractive surgery) and then after laser in situ keratomileusis (LASIK) surgery in the 15-day and 6-month follow-up visits.

Intraocular straylight and corneal morphology six months after LASIK.

Purpose: To assess the relationship between changes in human corneal morphology and intraocular straylight produced over time after laser in situ keratomileusis (LASIK).

Methods: Thirty subjects who underwent LASIK surgery were enrolled in this single-center, prospective and longitudinal trial. Twenty-five eyes were included in the study.

Relationship between anterior corneal asphericity and refractive variables.

Background: The anterior corneal surface is closely modelled by a conic section that is fully described by asphericity (Q) and the apical radius of curvature. Computerized corneal topographers have allowed for more accurate and complete descriptions of corneal shape. Our objective was to compare anterior corneal asphericity (Q) values determined for different corneal diameters in eyes of different refractive state.

Axial length, corneal radius, and age of myopia onset.

Purpose: This study was designed to establish variations in the biometry of the ocular globe according to refractive state, and to determine the extent to which these characteristics contribute to the appearance and degree of myopia.

Methods: Subjects recruited for the study were 583 university students of mean age 20.32 +/- 2.