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The diagnostic position views in this patient show the typical motility pattern of Brown syndrome in the right eye.  Because of the significantly better vision in the right eye, left eye fixation is not shown.  If the left eye were fixing in left gaze, the right hypotropia would be less and this would be called the primary deviation.  The full face picture showing the patient assuming left gaze is the characteristic posture for a horizontal null point nystagmus.

This 44-year-old woman has nystagmus which is less while she is looking to the left.  Her best corrected vision is right eye 20/20, left eye 20/80.

1.	This woman has a complex motility problem which most likely has:
	a -- This patient has a complex problem with two components.  One component has to do with the large left hypertropia and the second has to do with the damped nystagmus in left gaze.
2.	Achieving reduced nystagmus and better vision with a particular gaze position is characteristic of:
	d -- Damped nystagmus with gaze left in this case is an example of null point nystagmus.
3.	A large deviation in a poorer seeing eye occurring when the better seeing eye is used for fixation is characteristic of:
	b -- When a patient has significantly better vision in one eye, this eye usually takes up fixation.  In the case where this fixing eye has a paretic extraocular muscle or has a mechanical restriction causing excess innervation, the fellow eye will assume a greater deviation than would occur if this fellow eye with normal motility were fixing.  When the fixing eye has a paretic muscle or mechanical restriction, the deviation in the fellow eye is called a secondary deviation.