A device (700) for detecting gaze direction (α3, β3) of an eye (100), said device (700) comprising at least: - a first unit imaging (200) to acquire an image (201 ) of said eye 100, - at least one lighting unit (300) comprising a collimating optics configured to provide a first beam of substantially collimated light (LB1), and a second beam of substantially collimated light (LB2), having said collimated light beams (LB1, LB2) different directions relative to said device (700) such that said first collimated light beam (LB1) provides a first reflection point (G1) when light is reflected from the surface of the eye (100), and wherein said second collimated light beam (LB2) provides a second reflection point (G2) when light is reflected from the surface of the eye (100), appearing said reflection points (G1, G2) in said image (201), and - at least a beam expander to expand the width (WOUT) of collimated light beams (LB1, LB2), and - a processing unit data (600) to determine the gaze direction (α3, β3) of the eye (100) to said device (700), based on the position of said first reflection point (G1) in said image (201), the position of said second reflection point (G2) in said image (201), the position pupil (120) and / or iris (110) of the eye (100) in said image (201) and the directions of the collimated light beams (LB1, LB2).Un dispositivo (700) para detectar la dirección de la mirada (α3, β3) de un ojo (100), comprendiendo dicho dispositivo (700) al menos: - una primera unidad de formación de imágenes (200) para adquirir una imagen (201) de dicho ojo 100, - al menos una unidad de iluminación (300) que comprende una óptica de colimación, configurada para proporcionar un primer haz de luz sustancialmente colimado (LB1), y un segundo haz de luz sustancialmente colimado (LB2), teniendo dichos haces de luz colimados (LB1, LB2) diferentes direcciones con respecto a dicho dispositivo (700) de manera que dicho primer haz de luz colimado (LB1) proporcione un primer punto de r
