age	prescription	astigmatic	tear_rate	birth	lenses
pre-presbyopic presbyopic young	hypermetrope myope	no yes	normal reduced	python:DateVariable	none hard soft
					class
young	myope	no	reduced	08/19/2003	none
young	myope	no	normal	?	soft
young	myope	yes	reduced	?	none
young	myope	yes	normal	?	hard
young	hypermetrope	no	reduced	?	none
young	hypermetrope	no	normal	?	soft
young	hypermetrope	yes	reduced	?	none
young	hypermetrope	yes	normal	?	hard
pre-presbyopic	myope	no	reduced	?	none
pre-presbyopic	myope	no	normal	?	soft
pre-presbyopic	myope	yes	reduced	?	none
pre-presbyopic	myope	yes	normal	?	hard
pre-presbyopic	hypermetrope	no	reduced	?	none
pre-presbyopic	hypermetrope	no	normal	?	soft
pre-presbyopic	hypermetrope	yes	reduced	?	none
pre-presbyopic	hypermetrope	yes	normal	?	none
presbyopic	myope	no	reduced	?	none
presbyopic	myope	no	normal	?	none
presbyopic	myope	yes	reduced	?	none
presbyopic	myope	yes	normal	?	hard
presbyopic	hypermetrope	no	reduced	?	none
presbyopic	hypermetrope	no	normal	?	soft
presbyopic	hypermetrope	yes	reduced	?	none
presbyopic	hypermetrope	yes	normal	?	none
