A refractive power measuring method is disclosed wherein a pattern plate 8
is
disposed at a certain position in a measuring optical path in a measuring optical
system 1, a measuring light emitted from a measuring light source 5 is
received by a photosensor 9 through the pattern plate 8, a soft contact
lens TL is disposed at a certain position in the measuring optical path, and a
change of a pattern light received by the photosensor 9 is obtained to determine
optical characteristic values of the soft contact lens. According to this method,
the soft contact lens TL is disposed in a wet state at a certain position of the
measuring optical path and scattered light resulting from scatter of the measuring
light on a surface of the soft contact lens TL is received by the photosensor 9,
then a state of scatter of the scattered light is determined from a change of a
received light signal outputted from the photosensor 9 and there are obtained
optical characteristic values when the received light signal is below a preset value.