Intraocular lens, intraocular lens fixing assistance system, and image processing apparatus

An intraocular lens, comprising:

• an optical part that includes:
• a front surface and a back surface;
• and
• at least one mark including a first geometric pattern at the front surface and a second geometric pattern at the back surface, wherein
• the first geometric pattern is same as the second geometric pattern,
• the first geometric pattern is at an optical center position of the optical part on the front surface,
• the second geometric pattern is at the optical center position of the optical part on the back surface, and
• the at least one mark is detectable under illumination of a specific
• wavelength range outside a wavelength range of visible light;
• and
• a support part configured to support the optical part, wherein
• the at least one mark is for identification of each of the optical center position of the optical part and information regarding posture of the optical part in an eye,
• the at least one mark indicates the information regarding the posture based on a misalignment between the first geometric pattern on the front surface of the optical part and the second geometric pattern on the back surface of the optical part in a depth direction of the optical part, and
• the at least one mark indicates an amount of tilt of the intraocular lens and a direction of the tilt based on an amount of displacement between a center position of the first geometric pattern on the front surface of the optical part and a center position of the second geometric pattern on the back surface of the optical part.