September 10, 2012 | POSTED BY | Clinical Pearls
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When you are performing BO & BI ranges, remember what you are actually testing for:

Blur: Occurs from the loss of accommodation away from the object plane (our system will sacrifice clarity before singleness)

Break: Represents the loss of fusion when the limit of fusional vergence is reached

Recovery:  Consists of the person’s ability to voluntarily converge/diverge in response to spatial disparity (sensory information!)


* Bonus Pearl:  The recovery is probably the most important factor- it represents the patients ability to voluntarily regain fusion.  This is the key to understanding your patients functioning!

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