age		prescription	astigmatic	tear_rate	lenses
young		myope		no		reduced		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