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Prediction of visual outcome after treatment in children with amblyopia in dependence of initial monocular and binocular functions
Published in Jan-Tjeerd de Faber, 28th European Strabismological Association Meeting, 2020
In the group of children with refractive amblyopia significant correlations were established between visual acuity improvement (Δv) and initial visual acuity (VA) of amblyopic eye Rs = 0,87 and critical flicker fusion by phosphen Rs = 0,68 of the better eye. In the group with anisometropia significant correlations were found between (Δv) and critical flicker fusion by phosphen of the better eye in cases with central fixation Rs= − 0,79 and in cases with macular fixation Rs = 0,9. Children with strabismic amblyopia had following significant correlations between (Δv) and initial vision of amblyopic eye: Rs = 0,84; initial threshols on red colour of both eyes Rs = − 0,65; critical flicker fusion by phosphen of the sound eye Rs = 0,7 andmonocular fixation (MF), Rs = 0,93. Decreasing of deviation (Ad) correlated with mesopic vision of fixating eye(MV) Rs = 0,86, with Starlight test in three positions of gase Rs = − 0,74, p = 0,06; Lang II Rs= − 0,87, p = 0,02. Comparison of factors in groups with different improvement of vision in dependence of fixation in children with anisometropic amblyopia is presented in Tables 2,3.
Vision
Published in Nicholas Green, Steven Gaydos, Hutchison Ewan, Edward Nicol, Handbook of Aviation and Space Medicine, 2019
Nicholas Green, Steven Gaydos, Hutchison Ewan, Edward Nicol
Rod cells: Active at lower, scotopic, light intensities.Mesopic vision is intermediate stage between photopic and scotopic vision where both rods and cones are functioning (e.g. night flying).Maximum sensitivity at about 510 nm in blue/green part of spectrum (but do not contribute to colour perception).Photopigment (rhodopsin) becomes desensitised in higher light intensities so rods cease to function.times more sensitive to light than cones but respond more slowly and so less able to sense temporal changes (such as quick-changing images).Not present at high densities in macula; less detailed image than cones.
Horizontal Heterophoria Modifications by Means of Thin Proprioceptive Stimulations Applied on the Foot Sole: A Randomised Study
Published in Journal of Motor Behavior, 2022
The subjects were positioned in an upright position with their feet placed in contact with the Iron L-section, head straight and gaze directed towards the LED pen torch light. The assessment of herophoria was carried out in a mesopic vision condition, in order to allow a better visibility of the LED pen torch light. The subjects held the Maddox rod in front of their right eye (and subsequently in front of their left eye), with the cylinders horizontal. The operator held the spot of light at the tested subject’s eye level, at an initial distance of 40 cm (Casillas & Rosenfield, 2006; Howarth & Heron, 2000). The distance between the tested subject and the operator was assessed by a laser distometer placed on the ground and propped against an L-shaped iron, positioned in front of the tested subject’s feet. The distometer projected the laser beam towards another L-iron, placed in front of the tested subject’s feet (Figure 2).
Binocular contrast sensitivity in patients with intermittent exotropia in relation to angle of strabismus and level of compensation
Published in Strabismus, 2023
Fatemeh Moradi, Ali Mirzajani, Mohammad Reza Akbari, Masoud Khorrami-Nejad, Jamileh Abolghasemi, Babak Masoomian
In the CSV-1000 chart, the instruments automatically maintain a consistent and uniform testing light level through proprietary auto-calibration technology that monitors and adjusts the test lighting. For photopic testing, the unit calibrates test lighting to 85 cd/m2. When mesopic filters are used, the testing light level is held constant at 3 cd/m2, which is the mesopic light level recommended by the FDA to simulate night-driving conditions in clinical trials. Therefore, the mesopic vision was obtained with 1.5 neutral density filters.
Comparison of Corneal Tomography: Repeatability, Precision, Misalignment, Mean Elevation, and Mean Pachymetry
Published in Current Eye Research, 2018
Simon Schröder, Stephanie Mäurer, Timo Eppig, Berthold Seitz, Kathrin Rubly, Achim Langenbucher
The central 8 mm of the corneal diameter were considered most important for the optical system of the human eye. The calculations were done within this zone. In refractive surgery, the cornea is manipulated on a zone larger than the entrance pupil (optical image of the physical aperture) in order to preclude parafoveal glare. 25 Entrance pupil diameters for mesopic vision are typically below 8 mm. 26