| http://www.w3.org/ns/prov#value | - The optical element may be a rigid or pliable body, including a solid flat optical window, a sheet of pliable material, a shaped lens, a conformal window such as a window having a nipple shaped to conform to the Os of the cervix, a fluid filled sac, or a combination thereof, and may be made of various materials such as plastic, fused silica, glass, quartz, and other appropriate materials.
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