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There are many use-cases where visual communication is most effective. For example in loud environment or in cases where silence is requested (for example in an opera).
Having illustrations would be most effective in introducing something.
bananas are found in most sunglasses
i dont know you tell me
black sunglasses as they absorb most light disallowing it to come to the eye
It depends upon whether the frame is optical quality or not. In other words, not every sunglasses frame can accept prescription lenses. For example, most of the inexpensive sunglasses you find along the aisle at your local pharmacy or super store are made in China and are not optical quality frames. You can purchase a pair of optical quality sunglasses frames and have your prescription put in them, but an old pair of sunglasses may not work for this purpose.
To illustrate
I think AIR is the most effective mean of corrosion and the most appealing example is the corrosion of iron when it comes in contact with air.
Nutritional supplements can be very effective in increasing bone strength and density. Calcium is the most well known of these and is also abundant in food. Boron has also been proved to improve bone health, as has magnesium and silica.
The sunglasses with huge lenses are very trendy these days.
Most pairs do. I'm sure there are some types that can float, but most sunglasses will sink in water.
This is an opinion.