Glasses

1. Glasses for controlling light that is to enter an eye, comprising:

an optical element including a first liquid crystal layer that refracts the light; and

a control section configured to control refraction of the light by forming an electric potential gradient in a saw-tooth shape in the first liquid crystal layer through application of first control voltage to the first liquid crystal layer, wherein

the optical element includes a plurality of unit electrodes,

the unit electrodes each include a first electrode and a second electrode to which respective different voltages are applied,

the first electrode and the second electrode are located on the same layer level,

the potential gradient in the saw-tooth shape includes plural potential gradients, and

the plural potential gradients are formed in one-to-one correspondence with the unit electrodes.

2. The glasses according to claim 1 , further comprising

an eye detecting section configured to detect movement of the eye, wherein

the control section controls the first control voltage based on a result of detection by the eye detecting section.

3. The glasses according to claim 1 , wherein

the optical element further includes a light transmitting layer capable of controlling light transmittance of the light passing through the light transmitting layer.

4. The glasses according to claim 1 , further comprising

a pressure detecting section configured to detect pressure.

5. The glasses according to claim 1 , further comprising

an informing section configured to inform a whereabouts of the glasses in response to a specific signal that is wirelessly transmitted.

6. The glasses according to claim 1 , wherein

the optical element further includes an optical member that has aa saw-tooth shape in cross section and that deflects the light.

7. The glasses according to claim 1 , wherein

unit electrodes among the unit electrodes that are adjacent to each other are differ in width from each other.

8. The glasses according to claim 1 , wherein

the optical element further includes:

a plurality of resistive layers each disposed for a corresponding one of the unit electrodes, and

the resistive layers each have a resistivity that is larger than a resistivity of each of the unit electrodes and smaller than a resistivity of an electrical insulator.

9. The glasses according to claim 1 , wherein

the optical element further includes a second liquid crystal layer configured to refract light,

the second liquid crystal layer faces the first liquid crystal layer,

the control section applies second voltage to the second liquid crystal layer to form an electric potential gradient in a saw-tooth shape in the second liquid crystal layer,

liquid crystal of the first liquid crystal layer differs in alignment from liquid crystal of the second liquid crystal layer.

10. The glasses according to claim 2 , further comprising

a frame configured to support the optical element, wherein

the eye detecting section is disposed at the frame.

11. The glasses according to claim 3 , wherein

The light transmitting layer faces the first liquid crystal layer, and

the light transmittance is a ratio of a light quantity of light exiting from the light transmitting layer to a light quantity of light entering the light transmitting layer.

12. The glasses according to claim 3 , further comprising:

a frame configured to support the optical element; and

an environmental light detecting section disposed at the frame and configured to detect brightness of a surrounding environment of the glasses, wherein

the control section controls the light transmittance of the light transmitting layer based on a result of detection by the environmental light detecting section.

13. The glasses according to claim 4 , further comprising

a frame configured to support the optical element, wherein

the pressure detecting section is disposed at the frame.

14. the glasses according to claim 5 , further comprising

a frame configured to support the optical element, wherein

the informing section is disposed at the frame and emits light in response to the specific signal or outputs sound in response to the specific signal.

15. The glasses according to claim 6 , wherein

the optical member is a prism having a saw-tooth shape in cross section and is disposed opposite to the first liquid crystal layer.

16. The glasses according to claim 1 , further comprising:

a frame configured to support the optical element; and

an operation section disposed at the frame and configured to transmit an operation signal according to operation by a wearer of the glasses to the control section.