Retinoscopy Procedure completed after do retinoscopy calculation

1. RATINOSCOPY
calculation
BY SUJIT KUMAR
saraswati-eye-care.business.site

2. RATINOSCOPE
CONVERGING
5 CMS 10 CMS 50 CMS 100 CMS
66 cms
• 1 D MYOPIA 100 CMS
• 1.5 D MYOPIA 66 CMS
• 2 D MYOPIA 50 CMS
• 20 D MYOPIA 5 CMS

3. EXAMPLE DISTASNCE ATROPINE
+6.00DS +5.00DS +4.00DS
DISTANCE SUBTRACTION
• 1 mt =1 D
• 2/3 mt =1.50 D
CYCLOPLEGIC
• ATROPINE = -1.00 D
• HAMATROPINE = -0.50 D
• CYCLOPENTOLATE = -0.75 D

4. Few Algebraic rules for signs of Cylinders
• (-) (-) = (+)
• (-) (+) = (+)
• -6.00 -4.00 = -10.00
• -6.00 +4.00 = -10.00

5. Some Important steps
• While doing retinoscopy,we need to substract the working distance or
cyloplegic Drug value from the Horizontal and Verticle meridian.
• Then we assume the smallest power as the spherical value.
• Then the assume value as spherical value need to the substracted from the
other value use

6. “
”
-2.00 (180 axis)
-3.00
(90 axis)
-2.00-(+1.00) = -2.00-1.00 = -3.00 -3.00 180 axis
-3.00-(+1.00) = -3.00-1.00 = -4.00 -4.00
= -3.00 90 axis
= -4.00-(-3.00)=- 4.00+3.00 = -1.00
Spectale number = -3.00 D sph. / -1.00 D cyl *90

7. “
”
+2.00 (180 axis)
+4.00
(90 axis)
+2.00-(+1.00) = +2.00-1.00 = +1.00 +1.00 180 axis
+4.00-(+1.00) = +4.00-1.00 = +3.00 +3.00
= +1.00 90 axis
= +3.00-(-1.00)=-+3.00-1.00 = +2.00
Spectale number = +1.00 D sph. / +2.00 D cyl *90

8. “
”
-2.00 (180 axis)
+5.00
(90 axis)
-2.00-(+1.00) = -2.00-1.00 = -3.00 -3.00 180 axis
+5.00-(+1.00) = +5.00-1.00 = +4.00 +4.00
= -3.00 90 axis
= -4.00-(-3.00)=- 4.00+3.00 = +7.00
Spectale number = -3.00 D sph. / +7.00 D cyl *90

9. “
”
+2.00 (180 axis)
-3.00
(90 axis)
+2.00-(+1.00) = +2.00-1.00 = +1.00 -3.00 180 axis
-3.00-(+1.00) = -3.00-1.00 = -4.00 -4.00
= +1.00 90 axis
= -4.00-(+1.00)=-4.00-1.00 = -5.00
Spectale number = +1.00 D sph. / -5.00 D cyl *90

10. “
”
-2.00*90(Verticle)/-1.00*180(Horizontal)/66cm(WD)
-2.00*90(Verticle)/-3.00*180(Horizontal)/50cm(WD)
+3.00*90(Verticle)/+1.00*180(Horizontal)/66cm(WD)
-5.00*90(Verticle)/-4.00*180(Horizontal)/50cm(WD)
+4.00*90(Verticle)/-3.00*180(Horizontal)/50cm(WD)
-4.00*90(Verticle)/+5.00*180(Horizontal)/66cm(WD)
QUESTION
 POWER - (WORKING DISTANCE )= FINAL VALUE
 Mean POWER – (SPHERICAL POWER) = FINAL CYLINDER POWER