Sealing design , keep dust out 
(A)Measuring range: 
(1)SPH: 
0.00D~ -19.00D(-0.25D) 
+0.25D~ +16.75D(+0.25D) 
(2)CYL: 0.00D~ -8.00D(-0.25D) 
(3)AXIS: 0~180(5° Increment) 
(4)P. D: 50mm~ 78mm 
(B)Auxiliary lenses: 
(1)Occluder: Occluder 
(2)Pinhole plate: Pinhole plate(1mm) 
(3)P. D Check: P. D Check 
(4)Red/green filter: Red: Right green: Left 
(5)Polarizing: Right eye 135° 

(6)Polarizing: Left eye 45° 
(7)Lenses for retinscope: +1.50D 
(8)Cross cylinder lens: ± 0.50D 
(9)Balance check: Right eye: 6Δ B/U 
(10)Balance check: Left eye: 10Δ B/I 
(11)Moddx rod: Right eye horizontal/vertical 
(12)Moddx rod: Left eye white horizontal/vertical 

(C)Cross cylinder lens: ± 0.50D 
(D)Prism: Rotary prism0Δ ~ 20Δ 
(E)Dimension: 527(mm)X412(mm)X180(mm) 
(F)Weight: 6.6kg