Interpupillary Centration Flashcards
1
Q
Define: pupil distance (PD)
A
The distance measured in mm between the centre of the pupils.
2
Q
Define: near centration distance (NCD)
A
The distance between where the converging visual axes of the right and left eyes meet the spectacle plane.
3
Q
How to measure PD for someone with strabismus
A
Cover test: align the ruler binocularly then occlude each eye to turn to achieve an accurate PD measurement.
