An eyewear, comprising: a frame; an optical module to be disposed on the frame, the optical module having an optical property to be changed by electric control; a sensing section that acquires information on usage environments; and a control section that changes the optical property of the optical module based on the information acquired through the sensing section, the optical property includes at least a first optical property and a second optical property, characterized in that the control section performs, when a power source is on state, switching between a changeable mode and an unchangeable mode based on the information acquired through the sensing section, the changeable mode is a mode in which the control section changes the optical property based on the information acquired through the sensing section, the changeable mode includes: a mode in which the first optical property is changeable, the mode changing the first optical property of the optical module, and a mode in which the second optical property is changeable, the mode changing the second optical property of the optical module; the unchangeable mode is a mode in which the control section does not change the optical property even when the control section acquires the information through the sensing section, the control section changes the optical property of the optical module in the changeable mode, and the control section performs, based on a result of switching between the changeable mode and the unchangeable mode for one of the first optical property and the second optical property, switching between the changeable mode and the unchangeable mode for the other of the first optical property and the second optical property. a frame; an optical module to be disposed on the frame, the optical module having an optical property to be changed by electric control; a sensing section that acquires information on usage environments; and a control section that changes the optical property of the optical module based on the information acquired through the sensing section, the optical property includes at least a first optical property and a second optical property, characterized in that the control section performs, when a power source is on state, switching between a changeable mode and an unchangeable mode based on the information acquired through the sensing section, the changeable mode is a mode in which the control section changes the optical property based on the information acquired through the sensing section, the changeable mode includes: a mode in which the first optical property is changeable, the mode changing the first optical property of the optical module, and a mode in which the second optical property is changeable, the mode changing the second optical property of the optical module; a mode in which the first optical property is changeable, the mode changing the first optical property of the optical module, and a mode in which the second optical property is changeable, the mode changing the second optical property of the optical module; the unchangeable mode is a mode in which the control section does not change the optical property even when the control section acquires the information through the sensing section, the control section changes the optical property of the optical module in the changeable mode, and the control section performs, based on a result of switching between the changeable mode and the unchangeable mode for one of the first optical property and the second optical property, switching between the changeable mode and the unchangeable mode for the other of the first optical property and the second optical property.