6 24
contact prescription:    Hard,Soft,None;
instance number:         ignore;
age of patient:          Young,Pre-presbyopic,Presbyopic;
spectacle prescription:  Myope,Hypermetrope;
astigmatic:              N,Y;
tear production rate:    Reduced,Normal;
None, 1,  Young,          Myope,        N, Reduced;
Soft, 2,  Young,          Myope,        N, Normal;
None, 3,  Young,          Myope,        Y, Reduced;
Hard, 4,  Young,          Myope,        Y, Normal;
None, 5,  Young,          Hypermetrope, N, Reduced;
Soft, 6,  Young,          Hypermetrope, N, Normal;
None, 7,  Young,          Hypermetrope, Y, Reduced;
Hard, 8,  Young,          Hypermetrope, Y, Normal;
None, 9,  Pre-presbyopic, Myope,        N, Reduced;
Soft, 10, Pre-presbyopic, Myope,        N, Normal;
None, 11, Pre-presbyopic, Myope,        Y, Reduced;
Hard, 12, Pre-presbyopic, Myope,        Y, Normal;
None, 13, Pre-presbyopic, Hypermetrope, N, Reduced;
Soft, 14, Pre-presbyopic, Hypermetrope, N, Normal;
None, 15, Pre-presbyopic, Hypermetrope, Y, Reduced;
None, 16, Pre-presbyopic, Hypermetrope, Y, Normal;
None, 17, Presbyopic,     Myope,        N, Reduced;
None, 18, Presbyopic,     Myope,        N, Normal;
None, 19, Presbyopic,     Myope,        Y, Reduced;
Hard, 20, Presbyopic,     Myope,        Y, Normal;
None, 21, Presbyopic,     Hypermetrope, N, Reduced;
Soft, 22, Presbyopic,     Hypermetrope, N, Normal;
None, 23, Presbyopic,     Hypermetrope, Y, Reduced;
None, 24, Presbyopic,     Hypermetrope, Y, Normal;