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