Cornea

The cornea is the outermost layer of the eye. It is smooth, clear and referred to as the window of the eye, because the cornea allows light to pass through to the eye. The cornea also helps to shield the eye from harmful matter, such as dust and germs. It is responsible for about 65 percent of focusing power for the eye. When light enters through the cornea, it bends and refocuses the light to the retina, which begins translating the light into vision. In order to see clearly, the light rays must

The corneal profile refers to the contour of a cross section of the cornea which may be prolate, oblate or mixed. Prolate cornea appears to be steeper centrally than at the periphery while oblate cornea appears flatter centrally than peripherally. A mixed profile shows features of both oblate and prolate shapes at different corneal areas. The type of astigmatism seen in corneal topography

The cornea is most significantly affected by the active metabolic pump in the endothelium. This layer of cells in the posterior of the cornea maintain the fluid pump to keep the cornea dry and clear through the metabolic pump which is activated by temperature and the sodium potassium ATPase enzyme. The cell density of this basement membrane is vital as it is 7500 cells/mm2 and decreases with age (Michael 2014). If this cell density reaches low levels of approximately 300-500 cells/mm2 then a corneal

The patient’s eyebrows are symmetrically aligned and show equal movement when asked to raise and lower eyebrows. Eyebrows are of equal length and width and hair is equally distributed between both brows. Eyelashes appeared to be equally distributed, equal in length and curled slightly outward. There is a presence of mild eye discharge that is clear in color. No matting of the eye noted. No discoloration of the exterior eye or lids. No ptosis or edema. Lids close symmetrically with involuntary blinks

Influence of Surgical Factors on Postoperative Corneal Refractive Power and Astigmatism after Keratoplasty Mohamed Bahgat Goweida, FRCS, MD, Hany Ahmed Helaly, MD. Lecturer of Ophthalmology, Faculty of Medicine, Alexandria University Settings: Faculty of Medicine, Alexandria University, Egypt. Purpose: To analyze the influence of various surgical factors on the post-operative corneal refractive power and astigmatism after keratoplasty in eyes with corneal diseases. Methods: Retrospective study of

transplant done on my eye to repair my vision. The fear set in once again and not only did fear take over me, but fear took over my parents. I cried and wondered what surgery would be like, would I ever be able to see normal again, would I get the cornea needed for the transplant, and the thought of someone

their contact lens hygiene, leading their eyes to infection or inflammation. CONTACT LENS RISKS IN NUMBERS 93% of contact lens wearers claimed that they wear variety of soft contacts made of flexible plastics that allow oxygen to pass through the cornea. 99% say that, at least once in their lives, have cut corners in their contact lens hygiene. Almost 85% have showered with their lenses in and 61 went swimming wearing them even though health officials say lenses should not come in contact with

specific conditions such as keratoconus and aniseikonia that are usually corrected better by contacts than by glasses. [1] Because there is no blood supply to the cornea, it needs adequate oxygen to conserve its natural defenses, so contact lenses companies are constantly working to create new lenses which provide more oxygen to the cornea and overcome the disadvantages of current lenses used .[2] Soft contact lens has been introduce since 1971 by Bausch & Lomb, where are the most common type

• Rapid absorption and fast onset of action, it avoids hepatic first pass metabolism. Disadvantages of Ocular Drug Delivery System • Limited permeability across the cornea, drainage of the administered dose into the lachrymal duct, leads to systemic side effects and short term therapeutic effect due to eye blinking results in frequent dosage regimen. Barriers in Ocular Drug Delivery System 1. Drug loss from the ocular

patient’s cornea (layer that covers the coloring part of the eye) will be removed and replaced with a donor. This type of procedure is used if the cornea been damaged either from injury or infections. The patient will be under a local anesthesia (numbness of the eye) and medication to help the patient to relax. The surgeon will be using a special instrument to remove the damaged cornea and replaces it with the new cornea. The surgeon will use a special thread to connect the new cornea. After the