The etymology of the term crystalline brings us to the Latin crystallĭnus , although its root is found in the Greek krystallinos . It is an adjective that is used to describe what is typical of glass or that is made of this material.
For example: "Crystalline products are the most expensive since you have to invest a lot of money in their manufacture" , "The crystalline reflection moved the woman" , "The police found a ceramic vase and a crystalline vase on the table: in both they discovered drug ” .
Crystalline is also that which is transparent, diaphanous, limpid, translucent or sharp, even in a symbolic sense: "Our project is totally crystalline, anyone can see what we do with the donation money" , "The hotel's panoramic balcony offers a crystalline view " , " My grandmother was an affable woman, with a crystalline look and a frank smile . "
A crystalline person, for example, is one who communicates directly, without entanglement, who does not seem to hide bad intentions or double speeches. In this context we also speak of a transparent person , and both expressions point to the same thing, to a way of being absolutely sincere.
We should all aim to become crystalline individuals, to get rid of lies and bad feelings in order to connect with our environment in a clean and healthy way for everyone. Nobody likes fake people, who spread poison in their path, or those who always seem to be hiding something.
In the field of anatomy, the ocular structure that has the shape of a biconvex lens is called crystalline. It is located behind the pupil and in front of the vitreous humor in vertebrate animals and cephalopods.
Thanks to its high protein level, the lens has a higher refractive index than that presented by the fluids that are located around it. In this way, it achieves the refraction of light and enables the cornea to form images on the retina.
The lens manages to focus elements that are located at different distances through changes in their thickness and curvature. These modifications are called accommodation.
The curvature has a smaller radius on the front than the back; in the first, it borders the iris and the aqueous humor. These areas of the eye are called the posterior pole and the anterior lens, respectively; the line that joins their central points is known as the axis, and the distance at which they are separated, thickness.Two other important elements of the lens are the equator (the imaginary line that separates its two faces) and the diameter (the length of that line). As the lens undergoes an evolution that lasts the whole life of the human being, which takes place through the production of new layers, its size also grows: from the moment of birth to the third age, the thickness ranges from 3, 5 millimeters to 4.5, while the diameter starts at 6 millimeters and reaches 9.5.
The lens is lined by a clear, acellular, elastic capsule known as crystalloids, although it is generally simply called a capsule . In some way, this structure can be compared to that of a pea (which would be the lens) and the skin that covers it (the capsule).
To alter its curvature, the lens needs the ciliary muscle, with which it connects through fibers known as the zonule of Zinn. Regarding its internal structure, in the lens we can see a nucleus and a cortex. The anterior surface of the latter is wrapped in a tissue called epithelium, the only one of the lens that can regenerate.