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. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: Ophthalmology. 2008 Oct 29;116(1):145–153. doi: 10.1016/j.ophtha.2008.08.031

Table 1.

Grading Scale for Fixation Preference (FP) Testing

FP Grading Criteria
Grade Examiner Observations
A

  1. Spontaneous alternation between the right and the left eyes

  2. When switching the prism to the fellow eye causes FP to reverse
B “Holds Well” Fixation held with nonpreferred eye under any of the following circumstances before refixation to preferred eye:

  • for ≥3 seconds

  • during a smooth pursuit

  • through a blink
C “Holds momentarily” Fixation held with nonpreferred eye for 1 to <3 seconds
D “Does not hold” Refixation with preferred eye occurs immediately (<1 sec) when the occluder is removed from the preferred eye