What was the name of the corrective optics package installed during the December 1993 servicing mission?

Answer

COSTAR

COSTAR, short for Corrective Optics Space Telescope Axial Replacement, was the device installed to counteract the spherical aberration flaw in the primary mirror.

What was the name of the corrective optics package installed during the December 1993 servicing mission?
HubbletelescopeopticsHubble Space Telescopelaunchdefect