The primary aberrations that compensating eyepieces address include:
Chromatic aberration: This occurs when different wavelengths of light are refracted at different angles, causing color fringing. Spherical aberration: This happens when light rays passing through the edges of a lens focus at different points than those passing through the center, leading to a blurred image. Field curvature: This distortion causes the image to be in focus at the center but blurred at the edges.
