Back to results
US 12,765,772 B2Granted
Ophthalmic loupe, lens combination and optical imaging system
AssigneeCarl Zeiss Meditec AG
InventorChristian Beder
Life of this patent
Estimating the term…
Abstract
An ophthalmic loupe for generating an aerial image of a portion of an eye is provided. The ophthalmic loupe includes at least one lens, which in turn includes at least one aspheric lens face. In combination with the remaining lens faces, the at least one aspheric lens face generates an aerial image of the portion of the eye with a field of view with a negative distortion in its outer region. In this case, the absolute value of the negative distortion at the edge of the field of view is larger than 15%.
Claims18
An ophthalmic loupe for generating an aerial image of a portion of an eye, the ophthalmic loupe comprising:
- at least one lens having at least two lens faces,
- wherein at least one of the at least two lens faces is an aspheric lens face which in combination with a remaining lens face or remaining lens faces of the at least one lens generates an aerial image of the portion of the eye with a field of view with a negative distortion in its outer region,
- wherein an absolute value of the negative distortion at an edge of the field of view is larger than 15%,
- wherein the aspheric lens face generates an aerial image in which at least an outer 40% of the field of view has a negative distortion, and
- wherein the aspheric lens face leads to the negative distortion which, at least in the outer 40% of the field of view, increases more than proportionally in a direction of the edge of the field of view and can be described by a polynomial V(r) whose second derivative is negative.
2 more elements
Dependencies are inferred from the claim text.