Comparative studies: visual acuity with spectacles and flexible lenses, ophthalmometer readings with and without flexible lenses.
D001251:Astigmatism / Q000175:diagnosis*; D003263:Contact Lenses, Hydrophilic; D003315:Cornea; D005128:Eye Diseases / Q000175:diagnosis; D005139:Eyeglasses; D006801:Humans; D014792:Visual Acuity