Disposable ophthalmic lens
An ophthalmic lens with high definition, wide field of view and high magnification has, in one embodiment, a contact lens, an intermediate field lens and an image lens wherein a real image is formed inside the field lens. At least two of the lenses contribute to the magnification and three surfaces of the ophthalmic lens are aspheric to provide a better defined image. The ophthalmic lens is made disposable with high quality plastic lenses and a plastic holder. A portion of the holder changes appearance in response to change in environment to indicate that the disposable lens has been used.
1. An ophthalmic lens used in contact with an eye comprising:
a holder supporting a plurality of lenses;
a contact lens mounted in a first end of the holder, the contact lens having a first surface shaped to contact an eye when in use and a second surface that is aspheric;
an intermediate lens mounted in the holder and spaced between the contact lens and an image lens, the intermediate lens bending peripheral rays from the contact lens towards the image lens and contributing optical power; and
an image lens mounted in a second end of the holder with a positive first surface through which rays from the intermediate lens enter and are focused to form a real image inside the lens and a second surface that magnifies the real image wherein the contact lens, intermediate lens and image lens each have a thickness less than 14 mm.
2. An ophthalmic lens used in contact with an eye comprising:
a holder supporting a plurality of lenses;
a contact lens mounted in a first end of the holder, the contact lens having a first surface shaped to contact an eye when in use and a second surface that is aspheric;
an intermediate lens mounted in the holder and spaced between the contact lens and an image lens, the intermediate lens bending peripheral rays from the contact lens towards the image lens and contributing optical power; and
an image lens mounted in a second end of the holder with a positive first surface through which rays from the intermediate lens enter and are focused to form a real image inside the lens and a second surface that magnifies the real image wherein the contact lens, intermediate lens and image lens each have a thickness less than or approximately equal to 13 mm.