The present invention relates to a method for manufacturing an optical unit (10) for a collimator (11) with the optical unit (10) having a basic body (16) with a light ray entrance surface (17) for receiving light rays (13) within an initial beam (12) from a light source (14) and a light ray outlet surface (18) for emitting light rays (13) within a collimated beam (15), comprising the steps of: providing an imaginary reference surface (21) inside the optical unit (10), calculating the curvature of the light ray entrance surface (17) based on the imaginary reference surface (21) such that the light rays (13) within the initial beam (12) will pass the imaginary reference surface (21) in a perpendicular manner, calculating the curvature of the light ray outlet surface (18) based on the imaginary reference surface (21) such that light rays (13) within the collimated beam (15) are parallel to each other, and manufacturing the basic body (16) based on the calculated curvature of the light ray entrance surface (17) and the calculated curvature of the light ray outlet surface (18). The invention further relates to an optical unit (10), a collimator (11) and a lighting unit (50).
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