An extensive research has found that the eyelashes of mammals help protecting the sight from dust and other small particles that might affect them. The study has been made on 22 species of mammals by the Georgia Institute of Technology, proving that at each and every single one of them the eyelashes’ dimension represent one third of the width of the eye. The human eye has been included in the research, so the attention has been raised among our race too.
The researchers that have taken part of the study proved that this is the perfect length that they eyelashes should have, meaning that any longer or shorter lashes cause problems to the eyes, endangering their health and letting airflow and particles to cross some boundaries that they actually shouldn’t.
Guillermo Amador, researcher at the George W. Woodruff school of mechanical engineering and another the scientist that has taken part of the study have been making an effort of proving that the corneal surface must be protected by all costs. The evaporation rate on this surface is a very important fact that people should be taking care of, and the eyelashes’ barrier offers the protection that is needed in the area in order to maintain the health of the eyes at the best level possible.
“When eyelashes are shorter than the one-third ratio, they have only a slight effect on the flow. Their effect is more pronounced as they lengthen up until one-third.”
He also says that after that, they start funneling air and dust particles into the eye.
In order to drag all the conclusions that they needed, the team has sent a student to the American Museum of Natural History in New York, with a single, most important challenge: to measure in every possible way the eyes and the eyelashes of various animals that are found there. The specified ratio has been found at all the species that were part of the study, the only exception being the elephant, that has extremely long eyelashes.
Co-author David Hu has been part of a team that designed a wind-tunnel with the purpose of understanding how the air flows on a mimic of an adult, human eye. The cornea was represented by a 20-millimetre-diameter aluminum dish, having four-millimeters in depth and the eyelashes were meshes.
“As short lashes grew longer, they reduced air flow, creating a layer of slow-moving air above the cornea.”
Taking into consideration the development that fake eyelashes have brought to the world of makeup today, the scientists have tried to explain that long, luring, fake eyelashes are not such a good idea health-wise, because they affect the health of the eyes.
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