Attributes: age, prescription, astigmatic, tear_rate
Class: lenses
Data instances 24
Data instances with soft prescriptions:
young           myope           no              normal          soft           
young           hypermetrope    no              normal          soft           
pre-presbyopic  myope           no              normal          soft           
pre-presbyopic  hypermetrope    no              normal          soft           
presbyopic      hypermetrope    no              normal          soft           
