158 pieces of trial lenses in black/red METAL frames (+/-12D spherical, +/-4D cylindrical, 0.5-5D prism and 6 accessory lenses) full aperture, cylinder lenses with the cylinder axis set in line with the lens holder (easy to use in dark examination room)
The Maddox cross is a tangent scale for squint angle measurement and retinal correspondence testing. In association with rod can be used to subjectively detect and measure a latent (heterophoria), manifest, horizontal or vertical strabismus for near and distance.
The tangent scale is cross-shaped, sometimes its vertical arms are shorter. In the middle of the cross at the zero point, there is a small white light.
On the arms of the cross, there are scales marked with numbers. The horizontal arm of the cross is usually about 1 m long, allowing to examine eye deviations up to 10o with examination distance of 5m, and up to 5o with distance of 2 metres. Individual distances of the scales correspond to radians. The larger one is used for distance of 5 m, and the smaller one for distance of 1 m.
The treatment of amblyopia with the Campbell stimulator is based on the concept of active and controlled stimulation of the patient’s eye. Rotating stripes provide simple stimuli which stimulate the retina in terms of space and location.
The research shows that the cells of the cortex which are responsible for seeing pictures react best to moving lines of a certain width. The stimulator is designed so as to activate cells of the cortex and also the entire visual system.
Campbell used in his apparatus tests with high contrasting stripes, which rotate on the plate very slowly (one full rotation per minute)
During a task a child observes the stripes which are rotating very slowly while making different drawings on the glass or outlining the pictures. This facilitates their concentration on the stripes and trains eye and hand coordination at the same time. As soon as the visual acuity starts to improve the width of the stripes used for the task should be decreased
90 pieces of trial lenses in black/red METAL frames (+/-10D spherical, -3D cylindrical, 7 accessory lenses) full aperture, cylinder lenses with the cylinder axis set in line with the lens holder (easy to use in dark examination room)
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