Which instrument was designed to act like corrective eyeglasses to fix the mirror flaw during the servicing mission?

Answer

COSTAR

The corrective measure eventually took the form of instruments designed like corrective eyeglasses, specifically the COSTAR (Corrective Optics Space Telescope Axial Replacement) instrument.

Which instrument was designed to act like corrective eyeglasses to fix the mirror flaw during the servicing mission?

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