The aim of this study is to compare the perceptual eye positions (PEPs) among patients with different degrees of anisometropia.A total of 157 patients were recruited into this retrospective study. A detailed ophthalmic examination was conducted on each patient. The degree of refractive errors in the presence of astigmatism was converted into the degree of spherical equivalent (SE). Patients wer...

PURPOSE To measure the changes in astigmatism and in the degree of anisometropia when ametropes respond to accommodative stimulation. METHODS The accommodative responses of ametropes were binocularly measured with an improved photorefractometer (PR-1100), which objectively measured binocular refraction in all meridians simultaneously, when a visual fixation target was shown in natural space a...

PURPOSE To propose a comprehensive classification of anisometropia, a method to calculate the theoretical related aniseikonia (objective aniseikonia) and a purpose-designed eikonometer to measure aniseikonia psychophysically (subjective aniseikonia). SETTING University Hospital Antwerp, Department of Ophthalmology, Edegem, Belgium. METHODS The occurrence of anisometropia was evaluated in 26...

Editorials Anisometropia and amblyopia-chicken or egg? Amblyopia continues to attract tremendous interest from basic scientists and clinicians, yet surprisingly large gaps in our understanding of this topic remain. One of these is highlighted by Abrahamsson and Sj6strand who describe in this issue of the B7O (p 860) a meticulous follow up of 20 children to the age of 10 who at 1 year of age had...

PURPOSE We investigated changes in anisometropia and aniso-axial length with myopia progression in the Correction of Myopia Evaluation Trial (COMET) cohort. METHODS Of 469 myopic children, 6 to <12 years old, enrolled in COMET, 358 were followed for 13 years. Cycloplegic autorefraction and axial length (AL) in each eye were measured annually. The COMET eligibility required anisometropia (inte...

PURPOSE To describe prevalence of anisometropia, defined in terms of both sphere and cylinder, examined cross-sectionally, in school-aged members of a Native American tribe with a high prevalence of astigmatism. METHODS Cycloplegic autorefraction measurements, confirmed by retinoscopy and, when possible, by subjective refraction were obtained from 1041 Tohono O'odham children, 4 to 13 years o...

PURPOSE To perform an epidemiologic study in students in Natal/Brazil, with relation to refractional anisometropia, evaluating criteria such as: gender, age, and association with strabismus and amblyopia. METHODS A study of 1,024 students randomly selected from several districts of Natal/Brazil was undertaken by the Department of Ophthalmology of the Federal University of Rio Grande do Norte ...

IN the refraction clinic the visual improvement cannot always be correlated with the degree of anisometropia. The literature shows that anisometropic amblyopia is a well-recognized condition, but opinions differ regarding the relationship between anisometropia and amblyopia. As the published studies do not consider the factor of eccentric fixation as a possible variable, we have investigated it...

In a hospital population of 1356 children 64 (4.7%) cases of anisometropia (at least 2 diopters in spherical or cylindrical power) were found. After the exclusion of all children with ocular lesions 53 remained. Twenty-seven (42%) of them had strabismus, which seemed to be related to accommodation effort rather than amount of anisometropia. Amblyopia was present in 17 (53%) of the patients with...