Reserves refer to what in vergence testing?

Reserves refer to what in vergence testing?

• A. The remaining accommodative amplitude
• B. The phoria magnitude
• C. How much of the vergence range is left over after the phoria is accounted for
• D. The initial vergence demand

Answer: (C)

Reserves are the amount of fusional vergence the eyes can still mobilize beyond the latent misalignment to maintain single binocular vision. In vergence testing you consider the total vergence range available and the phoria, which is the latent deviation when fusion is not actively maintained. After accounting for that phoria, the leftover portion of the vergence range is the reserve. This reserve shows how much extra vergence the system can recruit to cope with changes in demand (like objects moving closer or farther). If reserves are insufficient, small changes can lead to diplopia or instability in fusion.

Reserves are the amount of fusional vergence the eyes can still mobilize beyond the latent misalignment to maintain single binocular vision. In vergence testing you consider the total vergence range available and the phoria, which is the latent deviation when fusion is not actively maintained. After accounting for that phoria, the leftover portion of the vergence range is the reserve. This reserve shows how much extra vergence the system can recruit to cope with changes in demand (like objects moving closer or farther). If reserves are insufficient, small changes can lead to diplopia or instability in fusion.