Viewing device to minimize parallax

A method for marking a cornea of a patient's eye, the method comprising:

• adjusting a direction of a light generated by a light producing apparatus to be in a desired direction, the light producing apparatus coupled to a viewing device worn by a person prepared to mark the cornea;
• polarizing the light with a first polarizing filter coupled to the viewing device;
• reflecting at least some of the polarized light from the patient's eye;
• receiving the reflected, polarized light through a second polarizing filter coupled to the viewing device;
• and
• marking a cornea of the patient's eye for purposes of making a surgical incision.

A viewing device comprising:

• an adjustable viewing assembly;
• at least two polarizing filters coupled to the viewing assembly;
• and
• a light producing apparatus coupled to the viewing assembly, the light producing apparatus adjustable to direct light through the first polarizing filter in a desired direction substantially coaxial with a line-of-sight of a first eye of a person prepared to mark the cornea, the directed light becoming a polarized light after passing through the first polarizing filter;
• wherein the first polarizing filter includes a polarization different than the second polarizing filter such that the polarized light is substantially blocked from travelling through the second polarizing filter after reflecting off of an object.

An apparatus for marking a cornea of a patient's eye, the apparatus comprising:

• a first polarizing filter positioned substantially coaxial with a line-of-sight of a first eye of a person prepared to mark the cornea;
• a light producing apparatus positioned on a first side of the first polarizing filter, the light producing apparatus adjustable to direct light through the first polarizing filter in a desired direction, the directed light becoming a polarized light after passing through the first polarizing filter;
• and
• a second polarizing filter positioned in a line-of-sight of a second eye of the person prepared to mark the cornea, the second polarizing filter configured to substantially block the polarized light reflected from the cornea.