• Maintain Natural Lid Shape
  The implant must provide a means, such as the ability to receive a motility/support peg, to support the weight of the artificial eye to prevent damage to the delicate muscles of the lower lids over time
• Light Weight
  The implant must be light in weight.
• Porosity
  The implant must allow vascular orbital tissues to invade its structure to: a) lock it into place and prevent migration, b) allow it to fight infections from within the implant via the vascular bed infiltrating the implant, and c) support "healing from within" of any defect in the conjunctival-Tenon's closure
• True Integration
  The implant must be directly integrated (e.g., via a peg) with the artificial eye to allow direct transfer of all available movement from the rectus muscles to the artificial eye
• Natural Biocompatibility
  The implant must be a natural material and readily accepted by the tissues of the orbit to prevent "synthetic implant syndrome" i.e., pseudocapsule formation around the implant. This pseudocapsule is the body's way of walling off a foreign material.

The natural hydroxyapatite orbital implant has the longest successful track record of any known implant material that can successfully accommodate a motility/support peg, which directly connects the artificial eye to the implant. The complete interconnected porosity filled with fibrovascular ingrowth makes this possible. The motility/support peg supports the weight of the prosthesis while simultaneously ensuring transfer of any socket movement directly to the prosthesis.

The Coated Bio-eye Hydroxyapatite Orbital Implant became available in November 2003. This is the most scientifically engineered and medically designed implant in the world.