Definition Optical illusion is any illusion of the sense of sight, which leads us to perceive the human eye.
They are not subject to the will and can vary from person to person, depending on factors such as visual acuity, perimetry, color blindness, astigmatism and other.
Someopticalillusions are: Gridillusion
Someopticalillusions are: Mirage
Someopticalillusions are: Stereogram
Understanding these phenomena is useful for understanding the limitations of human visual sense and the possibility of distortion, either in terms of shape, color, size and perspective of what is observed.
The optical illusion is also used in film, known is the technique of forced perspective that makes us see small models as real-world scenarios and giants.