A gesture detection device that includes an angled optical lens is disclosed. In one or more implementations, the gesture detection device includes a gesture sensor configured to detect electromagnetic radiation occurring within a limited spectrum of wavelengths and provides one or more signals in response thereto. The gesture detection device also includes an illumination source assembly configured to emit the electromagnetic radiation occurring within the limited spectrum of wavelengths. The illumination source assembly includes an illumination source for emitting the electromagnetic radiation occurring within the limited spectrum of wavelengths and a light collimating structure configured to at least partially collimate the electromagnetic radiation occurring within the limited spectrum of wavelengths. The light collimating structure is oriented at an angle with respect to an axis perpendicular to a surface of the gesture detection device.