Abstract: An auxiliary device for use with a head-mounted display (HMD) is disclosed. The auxiliary device includes a base plate configured to be detachably affixed to an interior surface of a front-facing panel of an HMD; a pair of nose pad arms extending from a first side of the base plate, each nose pad arm having a proximal end connected to the base plate and a distal end carrying a nose pad; and a lens holder frame extending from the first side of the base plate, the lens holder frame being configured to hold a first prescription lens and a second prescription lens in general alignment with a first display and a second display, respectively, of the HMD.

Abstract: An integrally formed pair of lenses has a curved body and a curved bridge formed on the middle portion to divide the body into two lens portions. The bridge has a radius of curvature different from that of the lens portions so a nose pad can be formed without any additional processes being necessary. Accordingly, the appearance of a pair of glasses with the integrally formed pair of lenses is versatile, and the cost of manufacturing the glasses is reduced.

Abstract: A method of attaching front hook eyeglasses onto an eyeglasses body with safety without producing any play therebetween. The method comprises the steps of rendering a curvature of a front curve of the front hook eyeglasses larger than that of the eyeglasses body, attaching a central portion of the front hook eyeglasses onto a central portion of the eyeglasses body, and bringing both ends of the front hook eyeglasses into elastically contact with the eyeglasses body. Vertical or horizontal motion (vertical and horizontal displacement) of the front hook eyeglasses or back and forth motion of the front hook eyeglasses are controlled or restrained.