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Mohamed Ibrahim
47 Views ยท 2 years ago

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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 โ€“ is capable of replacing itself within a few days after being damaged or removed. The deeper layer of the cornea โ€“ 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 patientโ€™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.

samer kareem
12,649 Views ยท 2 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.

samer kareem
2,878 Views ยท 2 years ago

Best Position for Getting Pregnant Fast

DrHouse
11,287 Views ยท 2 years ago

Direct puncture capsulorhexis with a slightly barbed 30g needle on a TB syringe with BSS permits excellent control even with very high vitreous pressure without use of viscoelastic. Ideal for biaxial (microincision) cataract surgery.

samer kareem
1,700 Views ยท 2 years ago

What is Wallenberg syndrome? Wallenberg syndrome is a rare condition in which an infarction, or stroke, occurs in the lateral medulla. The lateral medulla is a part of the brain stem. Oxygenated blood doesnโ€™t get to this part of the brain when the arteries that lead to it are blocked. A stroke can occur due to this blockage. This condition is also sometimes called lateral medullary infarction. The cause of the syndrome isnโ€™t always clear, however.

samer kareem
6,143 Views ยท 2 years ago

Minimally Invasive Brain Surgery To Remove Brain Tumors.

samer kareem
1,819 Views ยท 2 years ago

Varicose veins are generally benign. The cause of this condition is not known. For many people, there are no symptoms and varicose veins are simply a cosmetic concern. In some cases, they cause aching pain and discomfort or signal an underlying circulatory problem. Treatment involves compression stockings, exercise, or procedures to close or remove the veins.

Alicia Berger
1,347 Views ยท 2 years ago

Mumps Signs Symptoms Complications

DrHouse
18,814 Views ยท 2 years ago

Endoscopic Carpal Tunnel Release Surgery

Scott
2,132 Views ยท 2 years ago

Learn the basics of ECG (EKG) in one minute

usmle tutoring
6,679 Views ยท 2 years ago

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

Mohamed Ibrahim
32,140 Views ยท 2 years ago

basic subcutaneous (SQ) injection techniques

James Chapados
7,513 Views ยท 2 years ago

Dentist Kennewick WA Call (509) 783-8822

samer kareem
2,876 Views ยท 2 years ago

Acute aortic dissection can be treated surgically or medically. In surgical treatment, the area of the aorta with the intimal tear is usually resected and replaced with a Dacron graft. Emergency surgical correction is the preferred treatment for Stanford type A (DeBakey type I and II) ascending aortic dissection. It is also preferred for complicated Stanford type B (DeBakey type III) aortic dissections with clinical or radiologic evidence of the following conditions: Propagation (increasing aortic diameter) Increasing size of hematoma Compromise of major branches of the aorta Impending rupture Persistent pain despite adequate pain management Bleeding into the pleural cavity Development of saccular aneurysm

samer kareem
18,270 Views ยท 2 years ago

Since the first replant more than 50 years ago, thousands of severed body parts have been reattached, preserving the quality of life for thousands of patients through improved function and appearance that the void remaining after amputation cannot provide. Ronald Malt performed the first replantation on May 23, 1962 at Massachusetts General Hospital on a 12-year-old boy who had his right arm amputated in a train accident. [1, 2] This amputation occurred at the level of the humeral neck.

Mohamed Ibrahim
13,487 Views ยท 2 years ago

The bulb syringe is readily available, safe tool for clearing the airway of a newborn infant

samer kareem
1,628 Views ยท 2 years ago

Prevent Stretch Marks During Pregnancy

Harvard_Student
9,571 Views ยท 2 years ago

Pediatric Febrile Seizures

samer kareem
9,486 Views ยท 2 years ago

Echo Therapeutics Symphony tCGM Continuous Glucose Monitor

samer kareem
2,470 Views ยท 2 years ago

If you're sensitive do not watch this videoEmergent Tracheotomy!




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