Presentation on Neutralization steps of retinoscopy.pptx
1. 234-NSHM COLLEGE OF MANAGEMENT & TECHNOLOGY,
KOLKATA
Anuska Chakraborty
23401721014
2. A
.
B C
RED REFLEX DURING STREAK RETINOSCOPY: A, NEUTRALIZATION POINT; B, WITH MOVEMENT; C,
AGAINST MOVEMENT
3. IN A PATIENT WITH REGULAR ASTIGMATISM, TWO REFLEXES- ONE FROM EACH OF PRINCIPAL
MERIDIANS- NEED TO BE NEUTRIZED.
1. BREAK IN THE ALIGNMENT BETWEEN THE REFLEX IN THE
PUPIL AND THE BAND OUTSIDE.
2. WIDTH OF THE STREAK VARIES AS IT IS ROTATED AROUND
THE CORRECT AXIS.
3. INTENSITY OF THE REFLEX BAND IN PUPIL IS
BRIGHTER WHEN THE STREAK ALIGNS WITH TRUE AXIS.
4. SKEW ( OBLIQUE MOTION OF THE STREAK REFLEX ) MAY
BE USED TO REFINE THE AXIS IN SMALL CYLINDERS.
4. 1.
2.
3.
WHEN STREAK RETINOSCOPY IS PERFORMED, THE WIDTH OF THE REFLEX WIDENS
PROGRESSIVELY AS THE NEUTRALIZATION IS APPROACHED, & AT THE END POINT ,
STREAK DISAPPEARS & THE PUPIL APPEARS COMPLETELY DARK.
THE END POINT OF RETINOSCOPY CAN BE & SHOULD BE VERIFIED BY FOLLOWING
MANOEUVRES:
• OVERCORRECTION BY 0.25 D SHOULD CAUSE REVERSAL OF THE MOVEMENT.
• ON ALTERNATING THE WORKING DISTANCE, BY SLIGHT FORWARD MOVEMENT OF THE HEAD, THE EXAMINER
SHOULD OBSERVE A ‘WITH’ MOVEMENT & AN AGAINST MOVEMENT BY SLIGHT BACKWARD MOVEMENT.
