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The transparent eyeball is a philosophical metaphor originated by American transcendentalist philosopher Ralph Waldo Emerson. In his essay Nature , the metaphor stands for a view of life that is absorbent rather than reflective, and therefore takes in all that nature has to offer without bias or contradiction.
The aqueous humour is a transparent water-like fluid similar to blood plasma, but containing low protein concentrations.It is secreted from the ciliary body, a structure supporting the lens of the eyeball. [1]
More simply, the eyeball itself, as well as the ganglion cells in the retina that eventually transmit visual signals through the optic nerve. [1] A hollow structure, the bulbus oculi is composed of a wall enclosing a cavity filled with fluid with three coats: the sclera, choroid, and the retina. [2] Normally, the bulbus oculi is bulb-like ...
Illustration of Emerson's transparent eyeball metaphor in "Nature" by Christopher Pearse Cranch, ca. 1836-1838. Emerson uses spirituality as a major theme in the essay. Emerson believed in re-imagining the divine as something large and visible, which he referred to as nature; such an idea is known as transcendentalism, in which one perceives a new God and a new body, and becomes one with his ...
The cornea is the transparent front part of the eyeball which covers the iris, pupil, and anterior chamber. Along with the anterior chamber and lens, the cornea refracts light, accounting for approximately two-thirds of the eye's total optical power. [1] [2] In humans, the refractive power of the cornea is approximately 43 dioptres. [3]
Floaters are from objects in pockets of liquid within the vitreous humour, the thick fluid or gel that fills the eye, [7] or between the vitreous and the retina. The vitreous humour, or vitreous body, is a jelly-like, transparent substance that fills the majority of the eye.
The vitreous humor is a transparent, colorless, gelatinous mass that fills the space in the eye between the lens and the retina. It is surrounded by a layer of collagen called the vitreous membrane (or hyaloid membrane or vitreous cortex) separating it from the rest of the eye. It makes up four-fifths of the volume of the eyeball. [1]
The eyeball is generally less tall than it is wide. The sagittal vertical (height) of a human adult eye is approximately 23.7 mm (0.93 in), the transverse horizontal diameter (width) is 24.2 mm (0.95 in) and the axial anteroposterior size (depth) averages 22.0–24.8 mm (0.87–0.98 in) with no significant difference between sexes and age ...