The invention provides an ophthalmic device having adjustable filtering properties, comprising at least one first polarizer (18), at least one second polarizer (19) which is fixed relative to said first polarizer, and at least one adjustable filtering member (20) located between said first and second polarizers and configured to rotate a polarization plane of light received from said first polarizer and propagating towards said second polarizer; wherein said adjustable filtering member is configured to admit a plurality of active states, in each of which it rotates the polarization plane according to a respective and predetermined angle.

[Object] To provide a novel and improved surgical face guard with which a three-dimensional image can be used safely during medical treatment. [Solution] Provided is a surgical face guard, including a frame configured to be worn on a head of a medical worker, and a polarization shield configured to cover at least an in-front-of-eyes part and a part of a side-of-face surface of the medical worker, and have a predetermined polarization property with respect to a three-dimensional image.

[Object] To provide a novel and improved surgical face guard with which a three-dimensional image can be used safely during medical treatment.

[Solution] Provided is a surgical face guard, including a frame configured to be worn on a head of a medical worker, and a polarization shield configured to cover at least an in-front-of-eyes part and a part of a side-of-face surface of the medical worker, and have a predetermined polarization property with respect to a three-dimensional image.