Abstract: A head-mountable display apparatus comprising a headset (10) configured to fit over a user's eyes, in use, the mask having a rear wall (16) adjacent a user's eyes, in use, and an opposing front wall (12), the apparatus further comprising: at least one display screen (30) for receiving image data and displaying respective images thereon, said display screen (30) being mounted between said front and rear walls (12, 16) of said mask, wherein at least said distal ends of said display screen are curved so as to appear concave when viewed by the user, in use, wherein the rear wall (16) has a pair of apertures (18) therein, through which, in use, a user can view said display screen (30); and at least one optical element (20) mounted between a user's eyes and said display screen (30), when said mask is head mounted for user, wherein the or each optical element (20) has an adjustable optical property.