ABSTRACT
Alternating hyperphoria (synonyms: dissociated vertical deviation (DVD) or occlusion hyperphoria) and variants like 'unilateral patching hyperphoria' ('periodic vertical squint') and monocular vertical nystagmus, which may arise after strabismus operations or loss of the function of one of the eyes, have dynamic properties which differ from those of the vertical vergences or fusional movements in normal binocular vision. Alternating hyperphoria is the result of an early intense disturbance of binocular vision, leading to the absence of vertical fusional vergence or the detection of disparity necessary for this. Vertical disparity vergence is essentially a stabilizing and adaptive system.
Subject(s)
Convergence, Ocular/physiology , Strabismus/physiopathology , Vision Disparity/physiology , Adolescent , Adult , Aged , Humans , Vision Tests , Vision, BinocularABSTRACT
We found pigment alterations in the anterior segments of the eyes of patients with myotonic dystrophy. We therefore performed fluoro-photometry in a group of ten myotonic patients and the results were compared with those of a group of normal persons. The fluorescence levels in the aqueous and vitreous of the myotonic eyes appeared to be two or three times higher than in the normal eyes. This brings us to the conclusion that myotonic eyes have a defect in the blood-ocular barriers.
Subject(s)
Aqueous Humor , Fluorometry/methods , Myotonic Dystrophy/diagnosis , Vitreous Body , Aqueous Humor/analysis , Humans , Photometry/methods , Vitreous Body/analysisABSTRACT
An instrument has been developed that measures in ten seconds the level of fluorescein along a scanning line from the retina to the cornea. With spatial resolving power of 1.1 mm in the eye, concentrations of 1 X 10(-8) gr/ml fluorescein and higher are detectable. In this way an indication of the integrity of the blood-ocular barriers is achieved. In uveitis the dysfunction is mainly localised at the blood-aqueous barrier while in diabetic retinopathy the blood-retinal barrier is predominantly affected. Sources of error are discussed.
Subject(s)
Diabetic Retinopathy/diagnosis , Eye Diseases/diagnosis , Fluorometry/instrumentation , Uveitis/diagnosis , Adult , Choroid Neoplasms/diagnosis , Eye/blood supply , Female , Humans , Male , Melanoma/diagnosis , Middle AgedABSTRACT
An analysis is given of the eye movements which take place in vertical fusion. These movements are compared with the movements that occur in horizontal fusion. The differences and similarities that can lead to a model are stressed.
