Polarized 3D Glasses LZ.23900.001 For optimal 3D viewing, you will need to wear the polarized glasses and adjust the viewing angle and distance to get the bast picture. For Aspire 5738 / 5739 / 5740. Features The recommended viewing distance is 60 cm at 90°. Stereophonics effects may vary by content or viewing angle. 3D game effects and performance will vary depending on the system and graphics performance. Please Note Take a break if you feel uncomfortable. This glasses are not a toy.