There is provided an optical element for use with a LED wherein a base face is arranged to receive incoming light from the LED. The optical element comprises a top face having a pattern of optical structures which refract light away from an optical axis (A) of the optical element. Further the optical element comprises a plurality of side faces extending between the top face and the base face and arranged to refract light from the light towards the optical axis (A). the top face extends such that it covers a first angular range relative to the optical axis (A). The first angular range is an angular range outside which light emitted by the LED would be subject to total internal reflection at an imaginary extension of the top face.