Skip to main content

Embryology of the human Eye

The human eye anatomically is considered as an extension of the brain.the central nervous develop from the neural tube.A thickening appears on either sides of the neural tube in its anterior part known as OPTIC PLATE.The optic plate grows as the Foetus(baby) grows towards the surface to form the OPTIC VESICLE.the two eyes develop from these two optic vesicles.the neural ectoderm and mesoderm come together to form the optic vesicles.
As the foetus grows the optic visicles invaginates from in front and below to form the OPTIC CUP. there is a line of invagination that remains open  for sometime known as the embryonic fissure.the hyloid artery enters through the fissure to provide nutrients to the developing structures.later atrophies found dissapears.
The inner layer of the retina(main) is formed by the inner layer of the optic cup whiles the outer layer develops into the pigmented epithelium.the neural ectoderm is responsible for the secretion of the jelly-like fluid called the VITREOUS which fills the cavity.
The ciliary body and Iris are formed by the anterior portion of the optic Cup and mesoderm.the mesoderm around the cup differenciate into the coats of the eye,orbital structures,angle of the anterior chamber and main structure of the cornea.meanwhile, the surface ectoderm invaginates and later separates to form the lens.the surface ectoderm remains to form the corneal and conjunctival epithelium.Finally,the mesoderm in front of the cornea grows in folds,unites and separate to form the LIDS.

#REMEMBER :(the eye at Birth)
1.the orbit is more divergent(50%) as compared to an adult(45%)
2.eyeball is about 70% of Adult is fully developed at the age of 8 years.(emmetropization)
3.the newborn is hypertrophic by +2.5D
4.the cornea is approximately 80% of its adult size,being fully grown at the age of 3 years.
5.anterior chamber is shallow and the angle is narrow.
6.the newborn against the rule astigmatism and gradually shift to with the rule astigmatism as they mature.
7.extra ocular muscle and colour vision functions should be tested before three months.the newborn physiological and psychological development is impaired when childs vision is affected.

Get your BABY'S vision examined as early possible.
Remember the eye is the window to your soul.
When a man fails to appreciate seeing beauty of color in nature,color becomes relative for the Blind.

Post a Comment

Popular posts from this blog

Computer Vision Syndrome

What is computer vision syndrome? Computer vision syndrome(Digital Eye Strain) is a group of eye and vision related problems that results from prolonged computer use.
Many individuals spend prolonged time on near tasks,than at far.this puts stress on the visual system resulting in many discomforts:Near Point World.This technological generation predisposes us to spend more time on screen(laptop,smartphones,tablets) than on manual tasks,the eye always under stress and forced to adapt to tasks beyond its threshold.The average teen in the United States spends more than nine hours daily on the media for entertainment(playing computer games,Facebook,movies and office Jobs),the average 13- year old checks the social media more than hundred times daily.Analytically,people spend more time on screen than time to sleep.Prolonged  stress on the eye and other organs of the body presents clinical Alerts for multiple causes;Fatigue,asthenopia  and drowsiness.

Computer Us…


What is DRY EYE? Dry eye is a condition in which a person does not have enough quality tears to lubricate and nourish the eye.Tears are necessary to maintain clarity of the cornea and nourishes the front surface of the eye to ensure clear vision. Any anormaly in the integrity of the eyes tear film,the production or drainage can result in dry eye.This condition is often chronic and mostly affects the older adults.
The  lower and the upper eyelids mechanically spread over the ocular surface through neuronally controlled blinking mechanism to wet the corner and other ocular surfaces and exits through the nasolacrimal drainage system.then into the nose.
Tears provide lubrication,nourish ocular surface to reduce the risk of infections,wash away foreign substances that accidentally fall on the eye,keeps ocular surface smooth to allow clear vision.
What is the differences between dry eye and dry eye syndrome (keratoconjunctivitis sicca )
dry eye is the general condition in which a person doe…