Clement Clarke R.A.F. Near Point Rule

Description Of Item: Binocular gauge to measure objective and subjective convergence as well as accommodation. Overall measurements 590 mm long, 110 mm wide, 167 mm high. Black square section rod 500 mm long with cheek rest attached with imprints on each face and a black plastic foldable hand piece bearing a hand written label 'CLINICAL RESEARCH R3.' at the other end. Imprints are: Top face in centimetres in 2 cm divisions from 6 to 50, Left face in Age 8 to 48. Right face Dioptres 2 to 20. Bottom face CLEMENT CLARKE LTD. MADE IN ENGLAND. R.A.F. NEAR POINT RULE DEFECTIVE REDUCED NORMAL CONVERGENCE. A black plastic sliding carrier holds a four sided rotatable target with black on white imprints of a reduced Snellen Chart, a telephone directory extract, a near point reading chart N 5 to N 12 and a fixation line target.