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" I try to sit down at the typewriter four times a day, even if it's only five minutes, and write three sentences. And if I feel like going on, or if something turns me on I'll just keep writing till I'm written out." 
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	  Frank Herbert uses the idea of these artificial eyes to great effect in various stories, including Dune Messiah. The devices themselves are metallic, almost insectile in appearance. There is always the sense of distrust for technology that is often seen in Herbert's work. 
The Tleilaxu themselves are never seen in the original book; it is not stated whether the eye surgery is done on the host planet. 
 At present, there are no artificial or replacement eyes. However, scientists at the Space Vacuum Epitaxy Centre 
(SVEC) (University of 
Houston, Texas),  have developed, tiny ceramic photocells that could
detect incoming light and so
‘repair’ malfunctioning human eyes.
 
At the back of each of your eyes are about 120 million rods and around
six million cones. They convert light into electrical 
impulses which travel along 
the optic nerve to your brain. If these cells are damaged, the result is a loss of eyesight.
 
The first generation of artificial
retinas constructed at SVEC
consist of 100,000 tiny ceramic
microdetectors, each one
twentieth the size of a human hair. The arrays are
attached to a polymer film one
millimetre by one millimetre in size, large enough to be placed by the surgeon.
The film is designed to dissolve
after a couple weeks, leaving the
array in position on the retina.
Find out more at bionic eye surgery. 
Elsewhere in the novel, the Tleilaxu are described as producing not artifacts, but tools and services. Even war and poverty could be manufactured, and could be considered as either a destructive tool (poverty could wreck a rival's power) or a useful tool (war can focus the attention of a population, and can be used to cull unwanted population). The Tleilaxu are an interesting vision of what a corporation might look like in 10,000 years. Comment/Join this discussion ( 8 ) | RSS/XML | Blog This | Additional
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