Silicone hydrogel, contact lens, method for producing silicone hydrogel, and method for producing contact lens

A silicone hydrogel comprising water,

• wherein
• in a dried body produced by removing water from the silicone hydrogel, a ratio (A′/B′) of an average value (A′) of O/Si concentration ratios at a first measurement point to a third measurement point to an average value (B′) of O/Si concentration ratios at a 14th measurement point to a 16th measurement point is 1.20 or more,
• where
• each of the O/Si concentration ratios is a ratio of a proportion (atm %) of oxygen atoms to a proportion (atm %) of silicon atoms, the ratio being calculated from the proportion of oxygen atoms and the proportion of silicon atoms, the proportion of oxygen atoms and the proportion of silicon atoms being obtained by depth profiling using X-ray photoelectron spectroscopy at a surface of the dried body, and in etching of the dried body in a thickness direction from an outermost surface of the dried body by irradiation with an Ar ion beam generated under conditions of an ionizing energy of 3000 eV, a total of 16 measurement points are set in such a manner that the first measurement point (etching time:
• 0 seconds, the outermost surface of the dried body), a second measurement point (etching time:
• 50 seconds), and so on are sequentially set at every 50 seconds to the 16th measurement point (etching time:
• 750 seconds), and at each of the total of 16 measurement points, the corresponding O/Si concentration ratio is determined.