Nikon Corporation

Optos Plc

Yasufumi Nishi

Masahiro Mizuta

Alistair Gorman

David Michael Williamson

Makoto Fujimoto

Katsuya Watanabe

Gonzalo Muyo

Azuna Nonaka

Miwako Yoshida

Kyoya Tokunaga

An ophthalmic device for observing a subject eye, including: a light source; a scanning section that scans light from the light source; and an objective optical system configured to form a pupil, which has a conjugate relationship with a pupil of the subject eye, at the scanning section, wherein the objective optical system has, in order from the scanning section toward the subject eye, a first lens group that is positive, a second lens group that is positive, and a third lens group that is disposed between the first lens group and the second lens group, and that includes a concave surface configured to diverge light.

Ophthalmic device and ophthalmic optical system

An ophthalmic device includes a scanning member, an objective lens, and an optical element. The objective lens includes a first lens group and a second lens group in order from the scanning member side. The optical element is capable of being inserted into and removed from an optical path between the second lens group of the objective lens and the scanning member. In a case in which the optical element is not inserted into the optical path, the objective lens configures a first observation optical system. In a case in which the optical element has been inserted into the optical path, the objective lens and the optical element configure a second observation optical system.

Ophthalmic device and tomographic image generation device

The ophthalmic optical system is configured to apply an angular scanning light ray to an eye. M=|ωout/ωin| is defined, where ωin represents an angle between an incident light ray to the ophthalmic optical system and an optical axis of the ophthalmic optical system, and ωout represents an angle between an exiting light ray exiting from the ophthalmic optical system toward the eye and the optical axis. The ophthalmic optical system satisfies a conditional expression Mpar<Mmax, where Mpar represents M in a case that the incident light ray is a paraxial ray, Mmax represents M in a case that the incident light ray is a ray of a maximum angle of win.

Ophthalmic optical system, ophthalmic objective lens, and ophthalmic device

In a zoom lens comprising a first lens group (G) having positive refractive power, a second lens group (G) having negative refractive power, a third lens group (G) having positive refractive power, a fourth lens group (G) having negative refractive power, and a fifth lens group (G) having positive refractive power, the first to fifth lens groups (Gto G) are respectively moved along the optical axis so that a distance between the first lens group (G) and the second lens group (G), a distance between a distance between the second lens group (G) and the third lens group (G), a distance between the third lens group (G) and the fourth lens group (G), a distance between the fourth lens group (G) and the fifth lens group (G) respectively changes upon zooming from a wide-angle end state to a telephoto end state, so that a conditional expression '0.25&#x3c;f1&#x2212;/ft&#x3c;0.38' is satisfied.

Zoom lens, optical device, and method for manufacturing zoom lens

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Edinburgh, United Kingdom

Yasufumi Nishi