Disclosed are ophthalmic device materials having improved light transmission characteristics. The screen has a Fresnel lens sheet forming Fresnel lenses at an emission side, a first member for receiving light emitted from the Fresnel lens sheet having light passing windows, and a plurality of light absorbing layers and a second member placed on the emission side of the first member. A method for sharing content in a network may include: collecting contents related to a specific experience from a specific user; generating an experience graph of the specific experience; enabling the specific user to invite other users to join the experience graph; and enabling each user inside the experience graph to share new content into the experience graph. A novel liquid crystal device is also disclosed. The method is useful for flocculating China clay suspensions, suspensions of s welling clays, calcium carbonate suspensions, titanium dioxide suspensions, suspensions of coal tailings, red mud and phosphate slimes etc. Further, the first portion is arranged on a first circumference and the second portion is arranged on a second circumference, and wherein a diameter of the first circumference is larger than a diameter of the second circumference.