Horizontal and vertical prism bar set in lockable aluminium case. These optical prisms have been manufactured with great accuracy and are used for treating symptomatic binocular vision disorders and diplopia.
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Horizontal Prism Bar 
1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35 and 40
 
Vertical Prisms Bar
1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20 and 25