Which instrument was installed primarily to intercept the aberrated light path and redirect it correctly?

Answer

COSTAR

The main correction instrument installed was the Corrective Optics Space Telescope Axial Replacement (COSTAR), which acted like corrective glasses for the telescope.

Which instrument was installed primarily to intercept the aberrated light path and redirect it correctly?
Spaceastronomytelescopesciencespace explorationHubble Space Telescope