Sclera pass. The thickness of the sclera varies from 1mm at the posterior pole to 0.3 mm just behind the rectus muscle insertions. The sclera's blood vessels are mainly on the surface. Along with the vessels of the conjunctiva (which is a thin layer covering the sclera), those in the episclera render the inflamed eye bright red. In many vertebrates, the sclera is reinforced with plates of cartilage or bone, together forming a circular structure called the sclerotic ring. In primitive fish, this ring consists of four plates, but the number is lower in many living ray-finned fishes, and much higher
The Human Factor (2002 The Outer Limits) The Human Factor (2002 The Outer Limits) "The Human Factor" is an episode of the television show "The Outer Limits". It first aired January 11, 2002, in the show's seventh season. This episode is a clip show. Clips appear from the following episodes: "Phobos Rising", "Hearts and Minds", "Manifest Destiny", "Something About Harry", "The Haven", "Final Exam", "Final Appeal", "The Vaccine", and "Replica". Jupiter's moon Ganymede is now the only hope for the human race in 2084 as overpopulation and constant warring has left much of Earth uninhabitable. Space Commander Ellis Ward (Robert Duncan McNeill) must convince android assistant Link