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Designed to increase the comfort of doctors performing long- term studies/ treatments in a sitting position. Comfortable and adjustable seat (up/down) with tilting backrest.
Lower Seat: 53-73 cm
Higher Seat: 61-87 cm
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.
In the convergence apparatus, the idea of Bangerter has been used – so-called “snail”.
The AK-1 Convergence Trainer consists of a base on which two guide bars are placed in the form of two parallel metal rods. The guide allows for free movement between the brackets of the mechanism driving the test disk (Archimedes’ spiral). In the lower part of the mechanism there is a handle for moving the disc. On the front support there is a chin rest for comfortable observation of the moving test disc.
Thanks to the distance control and rotating “snail disc”, patient gets a very strong stimulus for the convergence (also in case of very low or underdeveloped fusion). The use of a rotating spiral makes it easy to focus attention on its center point.
General tech spec of MDT ophthalmic tables:
The visual coordinator uses the Haidinger’s phenomenon. The purpose of the exercise is fixation of the rotating propeller (fan). Patient with amblyopia (lazy eye) can see it only from a side. Haidinger’s brush is seen only with the macula, since it is dependent on its anatomical structure. In the macula there is a yellow pigment and a radial system of retinal fibers which makes it possible to see this phenomenon. What was used in the construction of the device is the fact that while gazing at an evenly lit, textureless surface through a polarizer we notice a form of a propeller or a bud creating an unclear dark cross. The phenomenon is more clearly visible with the use of a dark blue filter.
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
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