This is a multicentric, randomized, single-blinded clinical trial to evaluate the efficacy and safety of 3D printing for the planification and simulation of orbital decompression surgery for thyroid-associated orbitopathy.

Inclusion Criteria:

• Diagnosis of inactive thyroid-associated orbitopathy requiring bilateral orbital decompression (moderate-severe in EUGOGO classification).
• Volunteers older than 18 years old.
• Ability to read.
• Acceptation to participate and signature of informed consent.

Exclusion Criteria:

• Younger than 18 years old.
• Previous orbital surgery.
• Any coexisting disease preventing follow-up.