TRADITIONAL DEFINITIONS

 

[positive or negative]

[ BO or BI ] prism

 

I. Relative convergence (PRC, NRC) from the demand point--------to the blur point

 

2. Fusional convergence (PFC, NFC) from the phoria point----------to the blur point

 

3. Fusional reserve (PFR, NFR) from the phoria point--------to the break point

 

NEW CONCEPT: Relative convergence or fusional convergence recovery ranges!

 

 

[positive or negative]

[ + or - ] lenses

 

 

Relative accommodation (PRA, NRA) from the demand point-------to the blur point

 

 THE GRAPH

LEFT HAND FUNCTIONS

RIGHT HAND FUNCTIONS

NRC

PRC

PRA

NRA

distance BI break

distance BO break