light reflex vs reflex

light reflex and reflex both are nouns.

Word	Noun	Adjective	Verb	Adverb
light reflex	Yes	No	No	No
reflex	Yes	Yes	No	No

As nouns, reflex is a hypernym of light reflex; that is, reflex is a word with a broader meaning than light reflex:

light reflex: reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller
reflex: an automatic instinctive unlearned reaction to a stimulus

light reflex (noun)	reflex (noun)
reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller	an automatic instinctive unlearned reaction to a stimulus

light reflex (adjective)	reflex (adjective)
	without volition or conscious control