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LASIK or PRK? Which is right for me? Animation.
LASIK or PRK? Which is right for me? Animation. Mohamed Ibrahim 108 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.

How to treat Lower back pain and sacroiliac joint
How to treat Lower back pain and sacroiliac joint samer kareem 12,710 Views • 3 years ago

Dysfunction in the sacroiliac joint, also called the SI joint, can sometimes cause lower back and/or leg pain. Leg pain from sacroiliac joint dysfunction can be particularly difficult to differentiate from radiating leg pain caused by a lumbar disc herniation (sciatica) as they can feel quite similar.

Multicystic dysplastic kidney
Multicystic dysplastic kidney samer kareem 6,166 Views • 3 years ago

Multicystic dysplastic kidney (MCDK) is a condition that results from the malformation of the kidney during fetal development. The kidney consists of irregular cysts of varying sizes. Multicystic dysplastic kidney is a common type of renal cystic disease, and it is a cause of an abdominal mass in infants.

Taking Dental Impressions: Correction Impression
Taking Dental Impressions: Correction Impression samer kareem 1,409 Views • 3 years ago

A short introduction on how to take a correction impression. The shown materials are recommended by Orthorobot and have proven to be fully compatible with the Orthorobot lab procedure.

Meningitis and Encephalitis: Causes and Treatment
Meningitis and Encephalitis: Causes and Treatment samer kareem 1,655 Views • 3 years ago

A detailed discussion of the causes, diagnosis and management of the causes of Meningitis and Encephalitis. Includes bacterial, viral, fungal and autoimmune conditions as well as treatment of these conditions. Includes antivirals such as Aciclovir and Ganciclovir as well as IVIG and plasma exchange for autoimmune encephalitis.

How to Perform Nasal Irrigation with NasalCare
How to Perform Nasal Irrigation with NasalCare Nasal Care 9,788 Views • 3 years ago

Are you seeking sinus, allergy, or nasal congestion relief? Nasal irrigation, also known as nasal rinsining, is your solution! Nasal Care's nasal irrigation system is an all-natural, simple, and easy sinus and allergy treatment that brings gentle and soothing sinus relief. Visit www.nasalcleanse.com to learn more about the safe, simple and all-natural relief you can experience with NasalCare's nasal irrigation system.

USMLE Step 2 CS - Obesity
USMLE Step 2 CS - Obesity usmle tutoring 8,714 Views • 3 years ago

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

Root Canal Treatment
Root Canal Treatment samer kareem 27,279 Views • 3 years ago

During root canal treatment, the inflamed or infected pulp is removed and the inside of the tooth is carefully cleaned and disinfected, then filled and sealed with a rubber-like material called gutta-percha. Afterwards, the tooth is restored with a crown or filling for protection.

Blood Type
Blood Type samer kareem 3,443 Views • 3 years ago

There are four major blood groups determined by the presence or absence of two antigens – A and B – on the surface of red blood cells: Group A – has only the A antigen on red cells (and B antibody in the plasma) Group B – has only the B antigen on red cells (and A antibody in the plasma) Group AB – has both A and B antigens on red cells (but neither A nor B antibody in the plasma) Group O – has neither A nor B antigens on red cells (but both A and B antibody are in the plasma)

Female Reproductive System Anatomy
Female Reproductive System Anatomy Medical_Videos 19,420 Views • 3 years ago

Female Reproductive System Anatomy

Acanthosis Nigricans Insulin Resistance
Acanthosis Nigricans Insulin Resistance Medical_Videos 6,983 Views • 3 years ago

Acanthosis Nigricans Insulin Resistance

Porcelain Gallbladder
Porcelain Gallbladder samer kareem 6,637 Views • 3 years ago

Porcelain gallbladder is a condition characterized by calcium salt deposits in the wall of a chronically inflamed gallbladder. The calcifications can be thin or faintly visible, or may be amorphous, patchy, and thick. The gallbladder is generally large, but its size can vary considerably. Most porcelain gallbladders are associated with gallstones. A plain radiograph generally detects these, but computed tomography (CT) has a higher specificity; therefore, a CT scan is performed to confirm the diagnosis. Due to their high risk of gallbladder carcinoma, all patients with porcelain gallbladder should have an elective cholecystectomy.

Histology of Parotid Gland
Histology of Parotid Gland Histology 6,013 Views • 3 years ago

Histology of Parotid Gland

Removing Worms and Parasites From Girl's Teeth
Removing Worms and Parasites From Girl's Teeth hooda 98,862 Views • 3 years ago

Watch that video of Removing Worms and Parasites From Girl's Mouth

Ganglion Cyst Surgery
Ganglion Cyst Surgery samer kareem 3,958 Views • 3 years ago

Surgery involves removing the cyst as well as part of the involved joint capsule or tendon sheath, which is considered the root of the ganglion. Even after excision, there is a small chance the ganglion will return. A ganglion cyst at the wrist is removed during a surgical procedure called excision.

Diabetic Foot Surgical Debridement
Diabetic Foot Surgical Debridement Anatomist 10,799 Views • 3 years ago

Diabetic Foot Surgical Debridement

What is Cytomegalovirus (CMV) Infection CMV?
What is Cytomegalovirus (CMV) Infection CMV? samer kareem 1,585 Views • 3 years ago

Cytomegalovirus is a genus of viruses in the order Herpesvirales, in the family Herpesviridae, in the subfamily Betaherpesvirinae. Humans and monkeys serve as natural hosts.

Pediatric Surgery with MUSC Children’s Health
Pediatric Surgery with MUSC Children’s Health hooda 127 Views • 3 years ago

MUSC Children’s Health offers South Carolina’s only Level 1 Children’s Surgery Center, representing excellence in inpatient surgery at MUSC Shawn Jenkins Children’s Hospital, as well as outpatient surgery at R. Keith Summey Medical Pavilion. These two state-of-the-art facilities are equipped with a team of pediatric board-certified providers utilizing pediatric-specific devices and the most technologically advanced tools.

An ingrown toenail can be  treated at home.
An ingrown toenail can be treated at home. samer kareem 1,853 Views • 3 years ago

An ingrown toenail may be painful, but most you can treat at home. Here's how -- and when to call a doctor:

What are the risks with testosterone therapy in boys?
What are the risks with testosterone therapy in boys? samer kareem 4,379 Views • 3 years ago

Testosterone treatment in adolescent boys with constitutional delay

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