PURPOSE Refraction in the peripheral visual field is believed to play an important role in the development of myopia. The purpose of this study was to investigate the differences in peripheral refraction among anisomyopia, isomyopia, and isoemmetropia for schoolchildren. METHODS Thirty-eight anisomyopic children were recruited and divided into two groups: (1) both eyes were myopic (anisomyopi...

High myopia often appears as a familial disease. It is usually defined as a refraction error equal to or below −6 diopters (D) in each eye. Highly myopic patients represent 27-33% of the myopic population. The prevalence of the disease in the general population varies according to the country, from 2.1% in the USA, to 3.2% in France, and up to 9.6% in Spain. High myopia is also termed “patholog...

purpose: to compare visual outcomes and changes in high-order aberrations (hoas) following conventional versus customized photorefractive keratectomy (prk). methods: in this clinical trial, 58 eyes of 29 patients underwent myopic prk using the technolas 217z excimer machine. after comprehensive evaluation for refractive surgery, one eye of each participant randomly received conventional ablatio...

OBJECTIVE To assess the relationship of near, midworking distance, and outdoor activities with prevalence of myopia in school-aged children. DESIGN Cross-sectional study of 2 age samples from 51 Sydney schools, selected using a random cluster design. PARTICIPANTS One thousand seven hundred sixty-five 6-year-olds (year 1) and 2367 12-year-olds (year 7) participated in the Sydney Myopia Study...

High myopia often appears as a familial disease. It is usually defined as a refraction error equal to or below −6 diopters (D) in each eye. Highly myopic patients represent 27-33% of the myopic population. The prevalence of the disease in the general population varies according to the country, from 2.1% in the USA, to 3.2% in France, and up to 9.6% in Spain. High myopia is also termed “patholog...

X-ray refraction-based computer tomography imaging is a well-established method for nondestructive investigations of various objects. In order to perform the 3D reconstruction of the index of refraction, two or more raw computed tomography phase-contrast images are usually acquired and combined to retrieve the refraction map (i.e. differential phase) signal within the sample. We suggest an appr...

In photorealistic rendering, refraction is a vital optical phenomenon for transparent objects. This study proposes a real-time image-space method for approximate multiple refraction. First, a depth-peeling technique is used to disassemble a 3D polygonal model into four layers of normal and depth textures. Next, a modified ray-height-field intersection algorithm is employed to resolve discontinu...

PURPOSE To assess the impact of amblyopia, strabismus and glasses on subjective visual and psychological function among amblyopes. METHODS Questionnaires were administered to 120 teenagers with amblyopia (cases), with residual amblyopia after treatment, or with or without strabismus and 120 control subjects (controls) Cases underwent ophthalmic examination including cycloplegic refraction. Tw...