Arrangement and method for determining eye lengths

A method for measuring an eye (1) having a lens, cornea with a vertex, comprising:

• transmitting light beams (3, 4) from a light source (2) to the cornea (5) of an eye (1);
• controlling light source (2) with the control unit (6) for light beams (3, 4) from the light source;
• wherein the light beams are parallel are refracted by the lens (18) of the eye (1) and deflected onto approximately the same point or area of the retina under an individual angle of incidence;
• wherein the light beams are one of:
• a central light beam (3) and emits a plurality of peripheral light beams (4) radially offset from the central light beam (3) configured so that a point pattern is created on the cornea (5) of the eye (1), which is scattered around the vertex (10) of the cornea (5), or
• a plurality of peripheral light beams (4) radially offset from one another, so that a point pattern is created on the cornea (5) of the eye (1) which is scattered around the vertex (10) of the cornea (5);
• wherein the light beams are reflected by the eye as light beams (3a, 4a, 4b) are reflected by the interface layer (12) between the vitreous body (13) and the retina;
• the emitted light beams (3,4) are deflected onto approximately the same point or area of the retina under an individual angle of incidence (16) of the eye (1) in response to the emitted light beams (3, 4);
• detecting reflected light beams by the control unit;
• wherein, light beams (4a), the first peripheral light beams, are reflected by an interface layer (12) between the vitreous body (13) and the retina (14) are detected, which are reflected upon the incidence of the light beams (4) and that shows different intensities depending on the angle of incidence (16);
• wherein the light beams (4b), the second peripheral light beams, reflected by the retinal pigment epithelium (15) are detected, which are reflected upon the incidence of the peripheral light beams (4) and which each show intensities which are equal or lie within a predefined interval;
• and
• the peripheral light beams are parallel, refracted by the lens (18) of the eye (1), and are deflected onto approximately the same point or area of the retina under an individual angle of incidence;
• and
• wherein the respective detected intensities are used to distinguish the retina (14) or the retinal pigment epithelium (15) from an organ or structure not to be detected and/or to suppress or remove an artifact from the organ or structure not to be detected;
• and
• converting the detected light beams into signals (7, 8) by the control unit (6).