Capsule endoscope

A capsule endoscope, comprising:

• an illumination means;
• an imaging system that includes an objective optical system having a different near point distance for a central region of the field of view than the near point distance of the region that is peripheral to the central region of the field of view;
• and
• a transparent cover;
• wherein
• the objective optical system includes a meniscus lens element of positive refractive power and a plano-convex lens element.

A capsule endoscope comprising:

• an illumination source;
• an imaging system that includes an objective optical system;
• and
• a transparent cover;
• wherein
• the transparent cover has a larger radius of curvature in a central region of the field of view of the objective optical system than the radius of curvature of the transparent cover in a peripheral region of the field of view of the objective optical system, or
• the imaging system has a different near point distance for a central region of the field of view than the near point distance of a region that is peripheral to the central region of the field of view, and the objective optical system includes a meniscus lens element of positive refractive power and a plano-convex lens element.