Pupil pathology Flashcards
what is it called when the pupils are generally equal in size?
isocoria
what is the problem with small aperture?
diffraction
what is the problem with large apertures?
optical aberrations
what are the 2 muscles used to regulate pupil size?
sphincter and dilator
when the sphincter contracts …
the pupils miose
when the dilator contracts…
the pupils dilate
which branch of the nervous system innervates the sphincter muscle?
parasympathetic
which branch of the nervous system innervates the dilator muscle?
sympathetic
what is the pupillary near reflex?
pupils constrict when looking at near objects
what is the pupillary light reflex?
pupils contract to direct illumination and to illumination of the other eye
what is the pupillary light reflex controlled by?
1 afferent limb and 2 efferent limbs
where does the affront limb start and finish?
from the eye to the brain
where does the efferent limb start and finish?
brain to eye
what are the afferent and efferent limbs made up of?
8 neural pathways
