I guess your kids will be blind and develop sonar huh? LoL!!!
Hey pal, I can see pretty good in the dark too, because I have grey-blue eyes and fair skin and hair. IT'S NOT A GENETIC MUTATION HOWEVER.
Some people are born Albino's and have been born albino's for hundreds of years, but have yet to mutate, and their kids usually turn out normal. Unless of course they inherit the recessive gene.
No sonar enhanced blind bat kids have evolved, ever.
Charles Darwin expressed confidence that natural selection could explain the development of the eye; but how does this confidence stand up in the light of reason?
It would take a miraculous number of design changes to transform a light sensitive patch into an eyeball. Furthermore, each change would have to be coded onto the DNA of the "new" creature in order for the change to pass to the next generation. It has never been explained how this could have happened.
Each new feature would need to be independently useful or natural selection would not have allowed the new creature to live.
* An eyeball with no retina would be a tumor, not an improvement to be passed on to the next generation.
* An eyeball without a focusing lens would be worthless except as a light detector.
* An eyeball without a functioning optic nerve to carry the signal to the brain would be worthless.
* An eyeball without the perfect balance of fluid pressure would explode or implode.
* An eyeball without a brain designed to interpret the signals would be sightless.
So you see, an eyeball couldn't have evolved, nor will it, nor has there EVER been any proof that it has.
It is beyond credibility that chance mutations could produce any of these changes, let alone all of them at once. In Darwin's time the complex design of the eyeball was forceful evidence in favor of creation. Our more advanced knowledge of the intricate design of the eyes provide even stronger evidence for creation.
For instance, as we travel down the "evolutionary ladder" to examine those creatures which were supposedly among the earliest life forms on the planet, would it not be logical to expect their eyes to be less complex?
Contrary to this expectation, among the lowest rock layers are found multi-cellular creatures called trilobites which have an extremely sophisticated optical system. Some trilobites had a compound eye placed in such a way as to allow 360o vision.
Compound eyes are ideally suited for detecting minute motions and some trilobites eyes were specially designed to correct for spherical aberration allowing a clear image from each facet.
Even more impressive, each lens allowed for undistorted underwater imaging depth perception. Thus, one of the "earliest" in vertebrate creatures had clear underwater vision through eyes which could detect both depth and imperceptibility small motions in all directions simultaneously.
Yet this creature was not at the end of the supposed evolutionary line but near the beginning! Yet no direct ancestor to this incredible complex creature (or its eye) has been found.
The complexity of eyes still argue for the reality of instantaneous formation by an incredibly intelligent designer. There is neither a fossil record showing that the eye evolved nor any testable observations explain how it could possible happen.
With these facts in mind, why do we allow textbook selection which leaves out both the problems with evolution and the evidence for intelligent design? This is indoctrination, not education.
serious question: do you know what a genetic mutation or mutant gene is?
as to eyes:
planaria have no lens, eyeball, humours, corneas, etc...
they have specialized nerves running from the ganglia which can be (loosely) considered its brain, terminating on the surface in clusters of photoreceptive cells. These are the most primitive eyes of which I am aware. They are called "eyespots". They are, as you say, useful only as light detectors. However, even such limited sensors can differentiate intensity and, due to the fact that they are located in bilateral symmetry across the planarian's long axis and are found on one end of the animal, can allow the planarian to determine that light's directionality.
Limited, then, but advantageous nonetheless.
IIRC, one of the links on the List O'Links has detailed examples of intermediate eye developments, from the simple eyespot to the advanced structure with two of which the human normally comes equipped.