Examples of ocular screening are described herein. In an example, an examination system (100) for ocular screening comprises an illumination unit (104) for illuminating an eye of an examinee (142), and a metering engine (120) coupled to the illumination unit (104). The metering engine (120) may receive examining parameters, and based on the examining parameters received, determine characteristics of illumination receivable from the illumination unit (104) and generating control instructions to configure the illumination unit (104). In another example, based on the examining parameters received, the metering engine (120) may generate control instructions to configure the imaging unit (106). Further, an inspection engine (122) may receive examinee information, and based on examinee information received, determine a type of engaging-stimuli and trigger generating of an engaging-stimuli to obtain attention of the examinee. The images may be assessed to detect various ocular defects.