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LASIK or PRK? Which is right for me? Animation.
LASIK or PRK? Which is right for me? Animation. Mohamed Ibrahim 144 Views • 3 years ago

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Perfect for patient education purposes.
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LASIK, or "laser-assisted in situ keratomileusis," is the most commonly performed laser eye surgery to treat myopia, hyperopia and astigmatism. The goal of the treatment is to reshape the cornea to correct the refractive error of the eye.
The cornea is the transparent dome-shaped structure in front of the eye. The cornea refracts light and accounts for about two-thirds of the eye's total optical power. Altering the curvature of the cornea changes the way light rays enter the eye. As a result, the light rays can be focused properly onto the retina for clearer vision.
For nearsighted people, the laser is used to flatten the cornea. For farsighted people, the cornea is made steeper. For patients with astigmatism, the laser is used to smooth the irregularly-shaped cornea into a more regular shape.
The outer layer of the cornea - the epithelium – is capable of replacing itself within a few days after being damaged or removed. The deeper layer of the cornea – the stroma, on the contrary, is a permanent corneal tissue with very limited regenerative capacity. The stroma, if reshaped by a laser, will remain that way permanently.
In this procedure, a thin, circular "FLAP" is created in the surface of the cornea to gain access to the permanent corneal tissue. This can be done with a mechanical cutting tool called a microkeratome, OR, for a blade-free experience, by a femtosecond laser. An excimer laser is then used to remove some corneal tissue to reshape the cornea. Excimer laser uses cool ultraviolet light beams to vaporize microscopic amounts of tissue in a precise manner to accurately reshape the cornea. The excimer laser is computer-controlled and is programmed based on the patient’s refractive error. The flap is then laid back in place and is allowed to heal.
LASIK eye surgery is mostly painless and can be completed within minutes. Improved vision can usually be seen overnight.

PRK, or photorefractive keratectomy, was the first type of laser eye surgery for vision correction and is the predecessor to the popular LASIK procedure. In PRK, NO flap is created. Rather, the epithelial cells on the eye surface are simply removed. An excimer laser is then used to reshape the cornea just like it does in LASIK.
The vision correction outcomes of PRK surgery are comparable to those of LASIK, but the recovery period is longer. This is because the epithelium is completely removed in PRK and it takes a few days to regenerate. PRK patients also have more discomfort and haziness of vision in the first few days after the surgery. Improved vision also takes longer to achieve.
PRK does, however, offer certain advantages. Because PRK does not involve creation of a flap, which contains both epithelial and deeper stromal tissue, the entire thickness of the stroma is available for treatment. The treatment range is therefore higher. This is particularly useful for patients with high levels of myopia or for those whose cornea is too thin for LASIK. PRK is also free of flap-related complication risks.

Clogged Ear Due to Ear Infection or Eustachian Tube Dysfunction
Clogged Ear Due to Ear Infection or Eustachian Tube Dysfunction samer kareem 2,002 Views • 3 years ago

This video demonstrates why ears become clogged and why ear popping helps. The video also explains why ear popping may become difficult resulting in a persistent clogged or muffled ear especially after an ear infection.

Organophosphate Toxicity
Organophosphate Toxicity samer kareem 4,848 Views • 3 years ago

Organophosphate poisoning results from exposure to organophosphates (OPs), which cause the inhibition of acetylcholinesterase (AChE), leading to the accumulation of acetylcholine (ACh) in the body. Organophosphate poisoning most commonly results from exposure to insecticides or nerve agents.

Sinus operation via nose - Nasal Speculum
Sinus operation via nose - Nasal Speculum samer kareem 5,116 Views • 3 years ago

Acute sinusitis can be triggered by a cold or allergies and may resolve on its own. Chronic sinusitis lasts up to eight weeks and may be caused by an infection or growths. Symptoms include headache, facial pain, runny nose, and nasal congestion. Acute sinusitis usually doesn't require any treatment beyond symptomatic relief with pain medications, nasal decongestants, and nasal saline rinses. Chronic sinusitis may require antibiotics.

Transverse Myelitis
Transverse Myelitis samer kareem 4,323 Views • 3 years ago

-Rapidly progressive weakness of the lower extremities following an upper respiratory infection, accompanied by sensory loss and urinary retention, is characteristic for transverse myelitis.

Immunity System Attacking The Sperms Inside Woman's Body
Immunity System Attacking The Sperms Inside Woman's Body samer kareem 121,215 Views • 3 years ago

An antisperm antibody test looks for special proteins (antibodies) that fight against a man's sperm in blood, vaginal fluids, or semen. The test uses a sample of sperm and adds a substance that binds only to affected sperm. Semen can cause an immune system response in either the man's or woman's body. The antibodies can damage or kill sperm. If a high number of sperm antibodies come into contact with a man's sperm, it may be hard for the sperm to fertilize an egg. The couple has a hard time becoming pregnant. This is called immunologic infertility.

Bipolar disorder. Managment
Bipolar disorder. Managment samer kareem 1,895 Views • 3 years ago

Bipolar disorder, formerly called manic depression, is a mental health condition that causes extreme mood swings that include emotional highs (mania or hypomania) and lows (depression). When you become depressed, you may feel sad or hopeless and lose interest or pleasure in most activities. When your mood shifts to mania or hypomania (less extreme than mania), you may feel euphoric, full of energy or unusually irritable. These mood swings can affect sleep, energy, activity, judgment, behavior and the ability to think clearly. Episodes of mood swings may occur rarely or multiple times a year. While most people will experience some emotional symptoms between episodes, some may not experience any. Although bipolar disorder is a lifelong condition, you can manage your mood swings and other symptoms by following a treatment plan. In most cases, bipolar disorder is treated with medications and psychological counseling (psychotherapy).

Types of nystagmus
Types of nystagmus samer kareem 2,717 Views • 3 years ago

Nystagmus is a condition of involuntary (or voluntary, in rare cases) eye movement, acquired in infancy or later in life, that may result in reduced or limited vision. Due to the involuntary movement of the eye, it has been called "dancing eyes"

Soft simple painless surgical repair of umbilical hernia
Soft simple painless surgical repair of umbilical hernia Mohamed 13,782 Views • 3 years ago

Soft simple painless surgical repair of umbilical hernia

Serotonin Syndrome
Serotonin Syndrome samer kareem 3,452 Views • 3 years ago

Symptoms of serotonin syndrome include a classic triad of mental status changes (eg, anxiety, delirium, confusion, restlessness), autonomic dysregulation (eg, diaphoresis, tachycardia, hypertension, hyperthermia, diarrhea, mydriasis), and neuromuscular hyperactivity (eg, hyperreflexia, tremor, rigidity, myoclonus, ocular clonus). Serotonin syndrome is clinically diagnosed and laboratory tests are used to rule out other etiologies. It usually occurs due to inadvertent interactions between drugs, therapeutic use of multiple serotonergic agents, or serotonergic medication overdose. Treatment involves discontinuation of serotonergic drugs, supportive measures, and sedation with benzodiazepines. In severe cases, a serotonin antagonist (cyproheptadine) may be used.

Approach to bleeding disorders
Approach to bleeding disorders samer kareem 4,230 Views • 3 years ago

A detailed description of the approach to a use of bleeding disorders. This presentation includes the causes, history, clinical features and diagnosis of specific bleeding disorders. These include Haemophilia, DIC, Von Willebrand Disease and others. The final differentiation is often made on the basis of the Prothrombin Time, activated Partial thromboplastin time and platelet count.

Anatomy of the Human Abdominal Wall
Anatomy of the Human Abdominal Wall samer kareem 3,436 Views • 3 years ago

Clinical Anatomy Lecture Illustrate The Anatomy Of The Abdominal Wall

Diverticula, diverticulosis, & diverticulitis
Diverticula, diverticulosis, & diverticulitis samer kareem 6,701 Views • 3 years ago

What are diverticula? Diverticula are outpouchings that most commonly happen in the sigmoid colon of the large intestine. The presence of a diverticulum is defined as diverticulosis, whereas diverticulitis describes an inflamed diverticulum

Popliteal embolectomy
Popliteal embolectomy samer kareem 9,004 Views • 3 years ago

popliteal embolectomy; medial approach using a 4 f fogarty catheter

Shave and Punch Skin Biopsy
Shave and Punch Skin Biopsy Doctor 18,546 Views • 3 years ago

a video showing the technique of Shave and Punch Skin Biopsies nique of

Patent ductus arteriosus (PDA)
Patent ductus arteriosus (PDA) samer kareem 1,911 Views • 3 years ago

Patent ductus arteriosus (PDA) is a persistent opening between two major blood vessels leading from the heart. The opening, called the ductus arteriosus, is a normal part of a baby's circulatory system before birth that usually closes shortly after birth. If it remains open, however, it's called a patent ductus arteriosus. A small patent ductus arteriosus often doesn't cause problems and might never need treatment. However, a large patent ductus arteriosus left untreated can allow poorly oxygenated blood to flow in the wrong direction, weakening the heart muscle and causing heart failure and other complications. Treatment options for a patent ductus arteriosus include monitoring, medications and closure by cardiac catheterization or surgery.

USMLE Step 2 CS - Acute  Abdomen
USMLE Step 2 CS - Acute Abdomen usmle tutoring 9,283 Views • 3 years ago

USMLE Step 2 CS - Acute Abdomen- This is just preview video. To get full access please visit our website : www.usmletutoring.com

Making Rounds: Medical Education Documentary Film
Making Rounds: Medical Education Documentary Film Scott 199 Views • 3 years ago

Leading cardiologists Valentin Fuster, MD, PhD, Director of Mount Sinai Heart and Herschel Sklaroff, MD, Clinical Professor of Medicine, Cardiology at Mount Sinai Heart were filmed for one-month for the “Making Rounds” documentary film as they cared for critically-ill heart patients in the Cardiac Care Unit at The Mount Sinai Hospital.

Watch Mount Sinai Heart doctors, fellows, residents, and nurses in action and saving lives demonstrating how simply listening to patients at the bedside remains medicine’s most indispensable tool over any technology.

In this film Mount Sinai Heart helps preserve the disappearing art and science of how to examine and diagnose patients at the bedside for future generations of physicians.

**This film was made possible by the generous support
of the McInerney Family.**

Copyright 2015 Middlemarch Films, Inc

Skin Warts Infection
Skin Warts Infection samer kareem 9,480 Views • 3 years ago

A wart is a skin growth caused by some types of the virus called the human papillomavirus (HPV). HPV infects the top layer of skin, usually entering the body in an area of broken skin. The virus causes the top layer of skin to grow rapidly, forming a wart. Most warts go away on their own within months or years.

Portal Hypertension Pathophysiology
Portal Hypertension Pathophysiology samer kareem 3,121 Views • 3 years ago

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