Functional Anatomy of Muscle Mechanisms Compensating Vertical Heterophoria
| Autor: | Joseph L. Demer, Robert A. Clark |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Adult
Male medicine.medical_specialty genetic structures Fixation Ocular Extraocular muscles Article 03 medical and health sciences 0302 clinical medicine Ophthalmology medicine Diplopia Humans Prospective Studies 030304 developmental biology 0303 health sciences Vision Binocular medicine.diagnostic_test business.industry Fusional vergence Magnetic resonance imaging Middle Aged Magnetic Resonance Imaging eye diseases Hypertropic Strabismus Muscle relaxation medicine.anatomical_structure Oculomotor Muscles Heterophoria Fixation (visual) 030221 ophthalmology & optometry Female sense organs medicine.symptom business Muscle Contraction |
| Zdroj: | Am J Ophthalmol |
| Popis: | PURPOSE: Magnetic resonance imaging (MRI) of extraocular muscle function was used to evaluate the role of newly-recognized mechanisms underlying compensation of large heterophoria by vertical fusional vergence (VFV). DESIGN: Prospective case series. METHODS: At one academic center, 8 adults with large hyperphoria and super-normal VFV underwent MRI during monocular and binocular fixation of a centered, near target. Contractility of the rectus and the superior oblique (SO) extraocular muscles in the hypertropic and hypotropic eyes was determined from changes in posterior partial volume (PPV). RESULTS: Five of 8 patients could sustain binocular fusion in the scanner; in these patients, VFV corrected about 5° misalignment, about five-fold greater than normal VFV. Vertical strabismus was mainly compensated by significant contractility of the lateral more than medial compartment of the inferior rectus (IR) in both eyes (P |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|