Method and apparatus for measuring a lens

A method for measuring an anamorphic lens including:

• a first step of converging a beam of light emitted by a light source toward an anamorphic lens and adjusting said anamorphic lens along the progressing direction of the beam of light so that the beam of light reflected by said anamorphic lens forms a line spread function image on a focal plane;
• and
• a second step of measuring said anamorphic lens by observing changes of the image formed on said focal plane by moving said anamorphic lens.

A method for measuring an anamorphic lens including:

• a first step of converging a beam of light emitted by a light source toward an anamorphic lens and adjusting the anamorphic lens such that the beam of light reflected by said anamorphic lens forms a line spread function image on a focal- plane;
• and
• a second step of detecting tilt of a primary meridian of said anamorphic lens by observing changes of the image formed on said focal plane while rotating said anamorphic lens about an axis passing through the center of curvature within a plane where said line spread function image is formed and vertical to said plane.

A method for measuring a cylindrical lens including:

• a first step of converging a beam of light emitted by a light source toward a cylindrical lens and adjusting the same such that the beam of light reflected by said cylindrical lens forms a line spread function image on a focal plane;
• and
• a second step of detecting tilt of a generatrix of said cylindrical lens by observing changes if the image formed on said focal plane while sliding said cylindrical lens in the vertical direction with respect to the progressing direction of the beam of light within a plane where said line spread function image is formed.

A method for measuring an anamorphic lens including:

• a first sep of converging a beam of light emitted by a light source toward an anamorphic lens and adjusting said anamorphic lens such that the beam of light reflected by said anamorphic lens forms a line spread function image on a focal plane;
• and
• a second step of measuring profile irregularity of said anamorphic lens by observing the image on said focal plane at a time before and after the line spread function image is formed by moving said anamorphic lens forward and backward in the progressing direction of the beam of light.