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Biomedical subjects

J F Amos

Publications and source records attributed to J F Amos.

32 records · Page 2Linked to original sources
PubMed1985

Norms for hand-held rotary prism vergences.

Norms of clinically useful techniques provide a means to measure and compare patient performance against a large clinical population of asymptomatic subjects. This study establishes mean values for vergence ranges (break and recovery) at 6 m and 40 cm using hand-held rotary prisms. Secondary effects of eye preference (dominance), order of prism presentation, and differences of results between clinicians were evaluated and found to have no statistical significance. This is another example of the trend to establish normal values for functions routinely measured in the optometric examination. Values are now available for the most commonly used vergence testing methods: the binocular rotary prism in the phoropter, the prism bar, and the handheld rotary prism. Testing can now be accomplished with or without a phoropter and comparisons can be made to normal values.

Adolescent↗
PubMed1984

Idiopathic cysts of the anterior uvea.

Idiopathic cysts of the anterior uveal tract most frequently involve the epithelial layers of the ciliary body and iris. Idiopathic cysts occur less frequently in the iris stroma. Characteristically asymptomatic, most of the cases reported in the literature have been discovered during routine eye examination by slitlamp biomicroscopy as an iris elevation. Cysts of the epithelial layers rarely enlarge to cause ocular complications. Stromal cysts, although extremely rare, appear to have a greater propensity to enlarge. The visual prognosis for patients with idiopathic anterior uveal cysts is quite good. A review of the literature and examples of these disorders are presented to emphasize the clinical characteristics and management of patients with a diagnosis of idiopathic anterior uveal cyst.

Adult↗
PubMed1982

Diagnosis and management of monocular diplopia.

Monocular diplopia is a symptom which may range from a visual curiosity to being visually dehabilitating. Its proper diagnosis and management presents a challenge to the clinician. A comprehensive review of the literature illustrates the multiple etiologies which may produce this complaint. Differential diagnosis is an important factor in the ultimate successful management of the problem, since the latter is to a degree etiology specific. Method of differential diagnosis and management options are discussed.

Adolescent↗
PubMed1982

Idiopathic transient unilateral refractive change.

A case is presented in which a sudden refractive change and its subsequent recovery is documented by keratometry and subjective refraction measurements. Appropriate examination techniques demonstrate that the cornea and by inference other structures such as the lens are are the structures which have been affected. Various possible etiologies are discussed.

Adult↗
PubMed1979

Refractive amblyopia: a preventable vision condition.

There are very few visual conditions which can be greatly reduced or prevented. One exception to this statement is amblyopia, particularly refractive amblyopia. The methods and concepts for prevention are discussed and guidelines are proposed for the management of those pediatric patients "at risk" to develop refractive amblyopia or secondary strabismus.

Amblyopia↗
PubMed1979

Low plus lenses and visual performance: a critical review.

This paper reviews the research on which much of the clinical rationale for using low plus lenses is based. An indepth review of this research reveals some serious errors in research methodology and fails to find support for the clinical rationale which supports use of this form of management.

Adolescent↗
PubMed1978

Cone-rod dystrophy: a case report.

Cone-rod dystrophy is considered one of the rarer hereditary retinal degenerations. This disease can be easily mistaken for a number of other conditions because of its unusual characteristics. This paper discusses these characteristics and presents a case report to illustrate how the optometrist can effectively manage patients with this disease.

Adolescent↗
PubMed1978

Refractive amblyopia: a differential diagnosis.

The diagnostic characteristics of refractive amblyopia are discussed and compared to those of strabismic amblyopia. Those characteristics which have appeared in the literature include refractive error type, suppression pattern, fixation type, crowding phenomenon, effect of illumination on visual acuity, color vision and electrodiagnostic tests.

Amblyopia↗
PubMed1977

The Roth 28-hue test.

The Roth 28-hue test, first described in 1966, uses every third color cap from the Farnsworth-Munsell 100-hue (85-color-cap) test. Protans, deutans, and tritans exhibit slightly different confusion axes on the Roth 28-hue test and the Farnsworth D-15 test. These axes are illustrated on a CIE chromaticity diagram. The little-used Roth 28-hue test may be a good compromise between the D-15 and 100-hue tests, but clinical trials for verification are needed.

Adolescent↗
PubMed1977

Refractive amblyopia: its classification, etiology, and epidemiology.

The traditional classification of functional amblyopia and von Noorden's classification are compared to a problem-oriented classification. The newly proposed classification is different from the others primarily by its inclusion of refractive amblyopia. The etiology and epidemiology of refractive amblyopia are also discussed.

Amblyopia↗