age	prescription	astigmatic	tear_rate	lenses
discrete	discrete	discrete	discrete	discrete
				class
?	myope	no	reduced	none
young	?	no	normal	soft
young	myope	?	reduced	none
young	myope	yes	?	soft
?	hypermetrope	no	reduced	none
young	?	no	normal	soft
young	hypermetrope	?	reduced	none
young	hypermetrope	yes	?	soft
?	myope	no	reduced	none
pre-presbyopic	?	no	normal	soft
pre-presbyopic	myope	?	reduced	none
pre-presbyopic	myope	yes	?	soft
?	hypermetrope	no	reduced	none
pre-presbyopic	?	no	normal	soft
pre-presbyopic	hypermetrope	?	reduced	none
pre-presbyopic	hypermetrope	yes	?	none
?	myope	no	reduced	none
presbyopic	?	no	normal	none
presbyopic	myope	?	reduced	none
presbyopic	myope	yes	?	soft
?	hypermetrope	no	reduced	none
presbyopic	?	no	normal	soft
presbyopic	hypermetrope	?	reduced	none
presbyopic	hypermetrope	yes	?	none
