Test fixture for aligning center of lens

A test fixture for adjusting a position of a product, the test fixture comprising:

• a base;
• and
• an adjustable structure comprising a limiting block, at least one locking block, and at least one fixing member, wherein
• the limiting block is disposed on the base;
• the at least one locking block is disposed on the base and abuts an edge of the limiting block to lock the limiting block in position;
• the at least one fixing member is disposed on the limiting block to fix the limiting block on the base;
• when the at least one locking block is moved from a first position to a second position, the locking block unlocks the limiting block, the at least one fixing member is loosened, and the limiting block is rotatable on the base;
• and
• after the limiting block is rotated, the at least one locking block is moved from the second position to the first position to lock the limiting block, and the at least one fixing member is tightened to fix the limiting block on the base.