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24. Device ranges and tolerances
Interpupillary distance Adjustable range 45mm to 75mm
Horizontal movement of each arm independently Outwardly 40˚/70
∆
Inwardly 50˚/100
∆
Graduation ± 1˚/2
∆
Vertical rotation of each arm indepentently Angle of elevation 30
∆
Angle of depression 30
∆
Torsion movement of visual targets (cyclo-) Clockwise range 20
∆
Anti-clockwise range 20
∆
Graduation ± 1
∆
Chin-rest height Adjustable range from 71mm to 133mm from
chinrest to eyepiece centres bottom datum
∆
Prism dioptre equivalent correction at the patient’s eye. The actual linear tolerance will depend on the optical path
length of the occular arms.
Adjustment tolerence Accuracy
Interpupillary distance setting ±0,5mm
Lateral alignment of targets at zero setting ±0.5˚ or 1 dioptre
∆
Vertical alignment of targets at zero setting ±0.125˚ or ±0,25 dioptre
∆
Torsional alignment of targets at zero setting ±0.5˚
Alignment of targets throughout the horizontal
movement range with both arms locked together
Vertically ±10˚
Laterally ±0.5˚
Torsionally ±10˚
∆
The tolerances given are expressed in degrees when the scale is graduated in degrees, and in prism dioptres when
graduated in prism dioptres.
Synoptophore Instructions
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