The pupil is the dark circular opening in the center of the iris and is where<unk>  enters the eye. By analogy with a camera, the pupil is equivalent to aperture, whereas the iris is equivalent to the diaphragm. It may be helpful to consider the<unk>  reflex as an Iris' reflex, as the iris sphincter and dilator muscles are what can be seen responding to ambient<unk> . Whereas, the pupil is the passive opening formed by the active iris.<unk>  reflex is synonymous with<unk>  response, which may be<unk>  constriction or dilation.<unk>  reflex is conceptually linked to the side (left or<unk>  of the reacting pupil, and not to the side from which<unk>  stimulation originates. Left<unk>  reflex refers to the response of the left pupil to<unk> , regardless of which eye is exposed to a<unk>  source.<unk> <unk>  reflex means reaction of the<unk>  pupil, whether<unk>  is shone into the left eye,<unk>  eye, or both eyes. When<unk>  is shone into only one eye and not the other, it is normal for both pupils to constrict simultaneously. The terms direct and consensual refers to the side where the<unk>  source comes from, relative to the side of the reacting pupil. A direct<unk>  reflex is<unk>  response to<unk>  that enters the ipsilateral (same) eye. A consensual<unk>  reflex is response of a pupil to<unk>  that enters the contralateral (opposite) eye. Thus there are four types of<unk> es, based on this terminology of absolute (left versus<unk>  and relative (same side versus opposite side) laterality: # Left direct<unk>  reflex is the left pupil's response to<unk>  entering the left eye, the ipsilateral eye. # Left consensual<unk>  reflex is the left pupil's indirect response to<unk>  entering the<unk>  eye, the contralateral eye. #<unk>  direct<unk>  reflex is the<unk>  pupil's response to<unk>  entering the<unk>  eye, the ipsilateral eye. #<unk>  consensual<unk>  reflex is the<unk>  pupil's indirect response to<unk>  entering the left eye, the contralateral eye.
Pupillary light reflex
Vestibulo–ocular reflex
Moro reflex
Corneal reflex
Oculocardiac reflex
Red reflex
Ocular tilt reaction
Galant reflex