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Think about the pernese dragons. How are they able to see something? In fact, the best
explanation is there is no retina but instead the light receptors are distributed homogeneously in the eyes. This means a
photoreceptor near the surface can see the object far away and you go deeper into the eyes, the photoreceptors are able to
view objects that are closer.
This would also mean that the eyes are always focused no matter the distance
of the object (For Example, imagine a photo where the close objects are as sharp and crisp as the objects far away).
However, this dose not give the same precision as a retina since the dragon cannot have a
dense quantity of receptors without blocking the light; a dense quantity of cells would block the light for the layers deeper
in the eye (to some extant, in fact, cells are almost totally transparent).
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The advantage would be to always have the close and far object focused at the same time and
having a great deep perception even with a single eye. For humans and some other creatures having a binocular vision,
this is extremely useful for evaluating deepness but if your eyes are focussed on every distance all the time and if your
brain is able to tell which signals from which "layer" of photoreceptors, then the brain no longer need two eyes to know the
"exact" distance between the creature and an object. This would allow the dragon to have his eyes slightly more on the side
and have a greater angle of view without sacrificing their ability to determine deepness.
Another
advantage would be to increase the angle of the eyes, birds have their eyes on each side and human right in front. We humans
with our eyes squarely in the front of our heads, can see about 180 degrees, but we need to direct our eyes into the direction
of the object to have a clear picture. The crystalline type of eyes would be focused not only for object of all range but
also in all directions, this means once you come into their angle of vision, it is like if the dragon was looking directly
at you all the time while we cannot describe very well a person standing in the corner of our vision.
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