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Black Eye

  Black eye is the appearance of brusing around the eye. What causes a black eye? Blood vessels burst causing blood to pool in that area.  It causes due to trauma to the head or face. Small blood vessels or capillaries leak blood into the surrounding tissue. It can be an indicator of skull fracture. It causes black and blue color of bruises around the eyes to fade.  Shaken baby syndrome Broken nose Concussion Factor II deficiency Epidural hematoma  Diagnosing the cause of black eye If you suspect a skull fracture, immediately consult a doctor. You will be referred to a neurosurgeon for a possible head surgeon, Refer an ENT specialist for suspected fractures of the face. Your doctor will test your vision by shining light in your eyes.  If swelling and pain accompanies, apply a cold compress for 20 minutes. For pain and throbbing,take pain relievers such as ibuprofen or acetaminophen.

Night Blindness (Nyctalopia)

Night blindness is also known as Nyctalopia is the inability to see well at night or in poorly lit areas. It is usually a symptom of an existing underlying problem, associated with the retina, or the eye's lens. It presents itself when the cells of your retina, which allows a person to see in dim light, are affected, due to an underlying cause.  Causes of night blindness  Nearsightedness Glaucoma Cataracts Diabetes Retinitis pigmentosa, Vitamin A deficiency, and Keratoconus, to name a few.  Types of night blindness Stationary night blindness Congenital stationary night blindness (CSNB) with normal-appearing fundus CSNB with abnormal-looking fundus Fundus albipunctatus Oguchi's disease Mizzou's phenomenon The retina exhibits yellow sheen with light exposure, which becomes normal with prolonged dark adaptation. Progressive night blindness Retinal dystrophies Gyrate atrophy Choroideremia Goldmann-Favre disease Treatment of night blindness Treat the underlying cause: This tre...

Diabetic Retinopathy

 The retina is the inside layer of the eye. It's part of the AR that's most important for transmitting light into vision.  Diabetes affects essentially blood vessels in the eye and the rest of the body and it affects blood vessels in essentially two ways:  One way is it causes blood vessels to close down and blood vessels normally carry blood to various parts of the body and when the blood vessels closed down the eye as the rest of the body responds to that by creating new blood vessels and new blood vessels in the majority of the body are a good thing in that circumstance but in the eye, they are not such a good thing because there's new blood vessels over friable and more likely to bleed and the eye needs clarity in the middle to allow light to transmit to it.  The second way that it affects the blood vessels is it causes the blood vessels to leak and leaking from the blood vessels can damage the retina which as I mentioned that the inside part of the eye that's re...

Trachoma

  What it is? Trachoma is an infectious eye disease caused by a type of bacteria called chlamydia trachomatis . It is the leading infectious cause of blindness. There are several types of this bacteria causing different diseases. Trachoma is caused by types A B and C other types cause other diseases such as chlamydia and lymphoma Aloma venereum .  Causes The bacteria are spread from person to person through the eye nose and throat secretions of people who are infected.  It can spread directly from person to person or through an intermediary such as towels or washcloths contaminated with secretions, flies can also play a role in spreading the infection.  Trachoma occurs more commonly in young children.  It is also more common in women because of their greater contact with children.  Let's have a look at how bacteria cause disease.   These bacteria infect the conjunctiva.  The conjunctiva is the lining that covers and protects the front of the eye a...

Sports Vision

 What does it mean to have "good hands"? Hands are simply an instrument that we use to do the things that we do in sport. When a sportsperson makes a spectacular catch with one hand, it is his visual system that knew exactly when the ball would be where the ball was going to go so that he could use that hand to stop his flight and secure it to his body to make the catch and score the touchdown.  What does it mean, "a game of inches"? If you could mentally picture in most sports like in baseball field, the difference between when a ball is hit by a bat and the trajectory the tiniest little difference between when the ball hits it and the amount of spin it induces how far it goes that tiniest little bit of difference is a routine fly ball that's an out versus a home run versus a frozen rope or a line drive that hits the ground and keeps the game going in a positive way for the offense.  How are athletes using guided imagery to improve their performance? Keeping sp...

A guide to lens coatings

Are coatings on glasses worth it? ANTI-REFLECTIVE COATING, AR, or Non-Glare It's a really good idea for indoor use, such as in front of computer screens. It's gonna help considerably in terms of eye strain and eye fatigue. If you are gonna use these at night it's going to be fantastic at cutting the halos around headlights just giving you better optics. Overall it helps to cut glare bouncing off of the lens which means you're getting more of that light that you need to see actually making it to your eyes. A  fantastic idea for your clear lenses and your transitions lenses is almost an absolute must if we're talking about sunglasses, it's a really good idea on the backside of the lens because it helps to minimize glare and reflections bouncing off the backside overall this is a really good lens feature to include in your glasses.  SCRATCH-RESISTANT COATING One of the primary concerns with prescription lenses is are these going to scratch?  These are scratch-proof...

What is LASIK eye surgery?

What is it?    LASIK is a surgical procedure intended to reduce a person's dependency on glasses or contact lenses.  The term LASIK stands for laser-assisted in situ keratomileusis and is a procedure that permanently changes the shape of the cornea which is the clear covering over the front of the eye.   Because the lasering is done on the eyeball itself, it's described as " in situ ", or " on-site ." Its complete name is " laser in-situ keratomileusis " but you probably know it as LASIK . Essentially, this technique carves a patient's contact lens prescription onto their cornea. Like any surgical procedure,  LASIK comes with certain risks.               How does LASIK surgery actually work ?   LASIK is an outpatient surgical procedure that requires about 15 minutes per eye.                               Before the procedure:  Y...