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) all of the human race (including Ward's wife and daughter). The US President's spaceship, with the few remaining people, will arrive in several months. At this point Ward, having lost faith in life and his humanity, reactivates both Link and the self-destruct sequence and starts his last game of chess. When Link asks what has happened, Ward replies: "It was... human error." 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