optics: physics image magnification

Hi, i have a project to prepare a bio-scope. i need help with what type of the lens to use. i would be able to do the calculations. i just need the idea of type of lens required. Problem: I have a lcd screen (15")displaying a video. I plan to put it inside a box. I have to have a lens arrangement wherein person looks from outside with both the eyes on a big eyepiece ( or lens) and he should be able to see a virtual magnified image to a size 4 times without any spherical aberration or distortion . regards kashyap