Realistic
Medical
Illustration
Eye Anatomy and Diseases | By Dr. Abdelrahman Abdalla
Cairo | Egypt
Diabetes Macular Edema | (DME)
In this illustration we discuss a very important eye disease which is Diabetic Macular Edema | (DME) .
Diabetic macular edema is a swelling of the retina in diabetes mellitus due to leaking of fluid from blood vessels within the macula. The macula is the central portion of the retina, a small area rich in cones, the specialized nerve endings that detect color and upon which daytime vision depends.
The Illustration show the great affection of Diabetes on the macula and we see the macula After and Before, in the superior Illustration we see the normal macula and in the inferior one we see how could it be after affection of Diabetes that became swollen and edematous.
Age Related Macular Degeneration (AMD)
In this illustration we discuss another very important eye disease which is Age Related Macular Degeneration | (AMD)
Age Related Macular Degeneration is a medical condition that usually affects older adults and results in a loss of vision in the center of the visual field (the macula) because of damage to the retina.
It is a major cause of blindness and visual impairment in older adults, afflicting 30-50 million people globally.Macular degeneration can make it difficult or impossible to read or to recognize faces, although enough peripheral vision remains to allow other activities of daily life.
We discuss in this chart the two types of the disease which are "dry" and "wet" forms and you can determine the difference between them...
Dry AMD:
In this form Age-related macular degeneration begins with characteristic yellow deposits (drusen) in the macula, between the retinal pigment epithelium and the underlying choroid.
In this form Age-related macular degeneration begins with characteristic yellow deposits (drusen) in the macula, between the retinal pigment epithelium and the underlying choroid.
Wet AMD:
On another form Neovascular or exudative AMD, the "wet" form of advanced AMD, causes vision loss due to abnormal blood vessel growth (choroidal neovascularization) in the choriocapillaris, through Bruch's membrane.
On another form Neovascular or exudative AMD, the "wet" form of advanced AMD, causes vision loss due to abnormal blood vessel growth (choroidal neovascularization) in the choriocapillaris, through Bruch's membrane.
Eye Anatomy | Basic Illustration
In This Illustration we discuss the anatomy of the eye with a hyper-realstic eye illustration created by Dr. Abdelrhman Abdalla
We show the parts of the eye :
Anterior Chamber:
• The iris (the pigmented part)
• The cornea (a clear dome over the iris)
• The pupil (the black circular opening in the iris that lets light in)
• The sclera (the white part)
• The conjunctiva (a thin layer of tissue covering the front of the eye, except the cornea) etc...
• The cornea (a clear dome over the iris)
• The pupil (the black circular opening in the iris that lets light in)
• The sclera (the white part)
• The conjunctiva (a thin layer of tissue covering the front of the eye, except the cornea) etc...
and Posteior Chamber as well...
In a number of ways, the human eye works much like a digital camera:
Light is focused primarily by the cornea — the clear front surface of the eye, which acts like a camera lens.
The iris of the eye functions like the diaphragm of a camera, controlling the amount of light reaching the back of the eye by automatically adjusting the size of the pupil (aperture).
The eye's crystalline lens is located directly behind the pupil and further focuses light. Through a process called accommodation, this lens helps the eye automatically focus on near and approaching objects, like an autofocus camera lens.
Light focused by the cornea and crystalline lens (and limited by the iris and pupil) then reaches the retina — the light-sensitive inner lining of the back of the eye. The retina acts like an electronic image sensor of a digital camera, converting optical images into electronic signals.
The optic nerve then transmits these signals to the visual cortex — the part of the brain that controls our sense of sight.
and we continue to be more specialized on our illustration and discuss each part of the eye separately... such as:
Crystalin Lens of Human Eye | Anatomy and Physiology
The crystalline lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina. The lens, by changing shape, functions to change the focal distance of the eye so that it can focus on objects at various distances, thus allowing a sharp real image of the object of interest to be formed on the retina. This adjustment of the lens is known as accommodation (see also below).
Accommodation is similar to the focusing of a photographic camera via movement of its lenses. The lens is more flat on its anterior side than on its posterior side.
The lens is also known as the aquula (Latin, a little stream, dim. of aqua, water) or crystalline lens. In humans, the refractive power of the lens in its natural environment is approximately 18 dioptres, roughly one-third of the eye's total power.
The lens has three main parts:
the lens capsule
the lens Cortex
the lens Nucleus
the lens capsule
the lens Cortex
the lens Nucleus
The lens capsule forms the outermost layer of the lens and the lens fibers form the bulk of the interior of the lens.
The Details...
