purpose : to determine the association between astigmatism and spherical refractive error in a clinical population methods : in this cross-sectional study, 2,000 patients who presented to our optometry clinic were enrolled. all were tested for objective refraction with a nidek ar-310a auto refractometer, and non-cycloplegic refraction. for those under 15 years of age, cycloplegic refraction was...

THERE are some features relative to the size of the retinal images in these two conditions which are of general interest, though they are rarely discussed. Axial Ametropia.-The " basic " (blurred) retinal image is smallest in hyperopia, intermediate in emmetropia, and largest in myopia. The size of a blurred retinal image is best taken from the points in the diffusion circles at the extremities...

BACKGROUND This study aimed to investigate the clinical application of phakic toric intraocular collamer lens (TICL) implantation in treating ametropia following deep anterior lamellar keratoplasty (DALK) for patients with keratoconus, especially the effectiveness and safety of high astigmatism and indications of TICL implantation after corneal transplantation. METHODS Using the self-controll...

PURPOSE To group eyes in our refractive surgery unit on the basis of the origin of their ametropia and to assess the percentage of eyes in the different groups. METHODS Refractive parameters and the axial eye length (AL) of 131 eyes of 131 persons with different refraction were measured. The eyes were initially classified into five groups on the basis of the grade of their ametropia: hypermet...

PURPOSE To analyze the indications, type and complications of contact lens use and visual acuity in children, in ophthalmological, public and private, services. METHODS The information from the medical records of 59 contact lens users at a private service (Hospital de Olhos de Pernambuco - Recife - PE- Brazil - group 1), and 43 at public service (Fundação Altino Ventura - Recife - PE - Brazil...

makes it impossible to express the results in a general and informative manner. We felt, therefore, that it was useful to define two index that can be used for the purposes of such analysis. Metho& The axial and toric components of ametropia are such that it can be seen as a point within a threedimensional reference. The distance between the point and the centre of a reference defines the Refra...

Purpose: We aimed to evaluate negative impact on academic performance of University students in Kinshasa associated statics ametropia our setting. Methods: A cross-sectional study was performed the Department Ophthalmology Hospital from January June 2022. The Faculties, department and audience were taken carry out a survey three-stage probability sampling technique while enrolled register’s pre...

Purpose: To evaluate long-term results of the secondary piggyback technique used for the correction of undesired ametropia after phacoemulsification. Methods: Retrospective study comprising of 20 eyes (19 patients). The IOL used was a single-piece PMMA with an overall length of 12.5mm, a 5x6mm oval thin-edged optic with a 10-degree haptic angulation. The same technique was used in all cases, co...