The etymology of the crystalline term takes us to the Latin crystallĭnus, although its root is found in the Greek krystállinos. 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 a lot of money has to be invested in their manufacture”, “The crystal reflection moved the woman”, “The police found a ceramic vase and another crystal 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 crystal clear, anyone can see what we do with the donation money”, “The panoramic balcony of the hotel offers a crystal clear view ”, “My grandmother was an affable woman, with crystal-clear eyes and a frank smile”.
A crystalline person, for example, is one who communicates directly, without entanglements, who does not seem to hide bad intentions or double talk. 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.
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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 people who are fake, who spread poison in their path, or 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 the crystalline lens. 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 various distances through changes in its thickness and its curvature. These modifications are called accommodation.
The curvature has a smaller radius on the anterior face than on the posterior; in the first, it limits with the iris and with the aqueous humor. Said zones of the eye receive the names of posterior and anterior pole of the lens, respectively; the line that joins their central points is known as 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 said line). As the lens undergoes an evolution that lasts the entire life of the human being, which takes place through the production of new layers, its size also grows: from the moment of birth to old age, the thickness ranges from 3, 5 millimeters up to 4.5, while the diameter starts at 6 millimeters and reaches 9.5.
The lens is covered by a transparent, acellular, elastic capsule known as the crystalloid, although it is usually simply called the 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 Zinn’s zonules. Regarding its internal structure, in the lens we can see a nucleus and a crust. The anterior surface of the latter is covered in a tissue called epithelium, the only one of the lens that can regenerate.