Optomed

Optomed Oy

Juha Lipponen

Seppo Rönkkö

Ilkka Jolma

Markku Virta

Mikko Tuohimaa

Matti Pohjoisaho

Kalle Säippä

An ophthalmic apparatus includes an optical radiation source, which direct rays of optical radiation in a converging manner toward a reference plane, and causes the projections of the rays of optical radiation on a plane parallel to the normal of the reference plane to cross at a plane parallel to the reference plane and located deterministically relative to the reference plane, the crossing forming an alignment pattern of optical radiation on the reference plane. The ophthalmic apparatus, when directed toward the eye, captures images in a direction toward the reference plane including an area, where rays of optical radiation cross, and presents information on a pattern formed by the rays on a surface of a person or mammal whose eye the ophthalmic apparatus is directed toward. The alignment pattern when projected on an iris of the eye indicates that the iris of the eye is at the reference plane.

Ophthalmic apparatus and alignment method

A focus measuring arrangement for ophthalmic examination comprises an infrared light source system, which directs infrared light to a pupil of an eye of a person and forms a focusing pattern of the infrared light on a retina. A receiving arrangement apertures receives the infrared light of the focusing pattern from the retina through separate areas of the pupil. An image forming arrangement causes the infrared light passed through the apertures to form an individual image of the focusing pattern for each of the apertures in an image space of the receiving arrangement, the image forming arrangement causing an optical correspondence between the at least two apertures and the separate areas of the pupil. A detecting surface arrangement is located at a non-zero distance behind the at least two apertures and the image forming arrangement in a direction of propagation of the infrared light reflected from the retina for receiving the infrared light passed through the at least two apertures. A data processing unit forms focusing adjustment information based on locations of illuminated spots of the infrared light of the focusing pattern on the detecting surface arrangement, and outputs the focusing adjustment information for further processing.

Focus measuring arrangement and method of ophthalmic examination, and ophthalmic examination apparatus and method

There is provided an improved solution for illuminating an object by means of an optical component. In use, the optical component is integrated with a hand-held camera unit. The optical component comprises a light-diffusing element. In addition, the optical component may also comprise at least one light source and an end element that directs the light to the object.

Illumination of an object

Growing community of inventors

Oulu, Finland

Juha Lipponen