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Far-sightedness, also known as long-sightedness, hypermetropia, and hyperopia, is a condition of the eye where distant objects are seen clearly but near objects appear blurred. This blur is due to incoming light being focused behind, instead of on, the retina due to insufficient accommodation by the lens. Minor hypermetropia in young patients is usually corrected by their accommodation, without any defects in vision. But, due to this accommodative effort for distant vision, people may complain of eye strain during prolonged reading. If the hypermetropia is high, there will be defective vision for both distance and near. People may also experience accommodative dysfunction, binocular dysfunction, amblyopia, and strabismus. Newborns are almost invariably hypermetropic, but it gradually decreases as the newborn gets older.
LASIK or Lasik, commonly referred to as laser eye surgery or laser vision correction, is a type of refractive surgery for the correction of myopia, hyperopia, and astigmatism. LASIK surgery is performed by an ophthalmologist who uses a femtosecond laser or a microkeratome to create a corneal flap to expose the corneal stroma and then an excimer laser to reshape the corneal stroma in order to improve visual acuity.
Photorefractive keratectomy (PRK) and laser-assisted sub-epithelial keratectomy (LASEK) are laser eye surgery procedures intended to correct a person's vision, reducing dependency on glasses or contact lenses. LASEK and PRK permanently change the shape of the anterior central cornea using an excimer laser to ablate a small amount of tissue from the corneal stroma at the front of the eye, just under the corneal epithelium. The outer layer of the cornea is removed prior to the ablation.
A microkeratome is a precision surgical instrument with an oscillating blade designed for creating the corneal flap in LASIK or ALK surgery. The normal human cornea varies from around 500 to 600 μm in thickness; and in the LASIK procedure, the microkeratome creates an 83 to 200 μm thick flap. The microkeratome uses an oscillating blade system, which has a blade that oscillates horizontally as the blade travels vertically for a precise cut. This piece of equipment is used all around the world to cut the cornea flap. The microkeratome is also used in Descemet's stripping automated endothelial keratoplasty (DSAEK), where it is used to slice a thin layer from the back of the donor cornea, which is then transplanted into the posterior cornea of the recipient. It was invented by Jose Barraquer and Cesar Carlos Carriazo in the 1950s in Colombia.
Eye surgery, also known as ophthalmic surgery or ocular surgery, is surgery performed on the eye or its adnexa. Eye surgery is part of ophthalmology and is performed by an ophthalmologist or eye surgeon. The eye is a fragile organ, and requires due care before, during, and after a surgical procedure to minimize or prevent further damage. An eye surgeon is responsible for selecting the appropriate surgical procedure for the patient, and for taking the necessary safety precautions. Mentions of eye surgery can be found in several ancient texts dating back as early as 1800 BC, with cataract treatment starting in the fifth century BC. It continues to be a widely practiced class of surgery, with various techniques having been developed for treating eye problems.
Radial keratotomy (RK) is a refractive surgical procedure to correct myopia (nearsightedness). It was developed in 1974 by Svyatoslav Fyodorov, a Russian ophthalmologist. It has been largely supplanted by newer, more accurate operations, such as photorefractive keratectomy, LASIK, Epi-LASIK and the phakic intraocular lens.
Refractive surgery is an optional eye surgery used to improve the refractive state of the eye and decrease or eliminate dependency on glasses or contact lenses. This can include various methods of surgical remodeling of the cornea (keratomileusis), lens implantation or lens replacement. The most common methods today use excimer lasers to reshape the curvature of the cornea. Refractive eye surgeries are used to treat common vision disorders such as myopia, hyperopia, presbyopia and astigmatism.
An Intraocular lens (IOL) is a lens implanted in the eye usually as part of a treatment for cataracts or for correcting other vision problems such as short sightedness and long sightedness; a form of refractive surgery. If the natural lens is left in the eye, the IOL is known as phakic, otherwise it is a pseudophakic lens. Both kinds of IOLs are designed to provide the same light-focusing function as the natural crystalline lens. This can be an alternative to LASIK, but LASIK is not an alternative to an IOL for treatment of cataracts.
A phakic intraocular lens (PIOL) is an intraocular lens that is implanted surgically into the eye to correct refractive errors without removing the natural lens. Intraocular lenses that are implanted into eyes after the eye's natural lens has been removed during cataract surgery are known as pseudophakic.
LASIK MD is a North America provider of laser vision correction and the largest provider of laser vision correction in North America based on procedure volume. As of 2013, LASIK MD performs over sixty percent of all laser vision correction procedures in Canada.
Avi Wallerstein is a Canadian ophthalmologist and laser eye surgeon who specializes in surgical vision correction, also termed refractive eye surgery. He practises in Montreal and Toronto. In 2001, he co-founded LASIK MD with Mark Cohen. LASIK MD is Canada's largest provider of laser refractive surgery, performing over 60,000 procedures a year. He is one of only 14 certified CLasik instructors in North America.
Stephen Updegraff, M.D., FACS is an American refractive surgeon best known for his early involvement in, and contributions to, LASIK. He is a Fellow of the American College of Surgeons, a board-certified member of the American Board of Ophthalmology, a founding member of the American College of Ophthalmic Surgeons, and a member of the International Society of Refractive Surgery, the American Academy of Ophthalmology, the American Society of Cataract and Refractive Surgery, and the Pine Ridge Eye Study Society. Updegraff currently serves as the medical director of Updegraff Vision in St. Petersburg, Florida.
Diffuse lamellar keratitis (DLK) is a sterile inflammation of the cornea which may occur after refractive surgery, such as LASIK. Its incidence has been estimated to be 1 in 500 patients, though this may be as high as 32% in some cases.
Laser blended vision is a laser eye treatment which is used to treat presbyopia or other age-related eye conditions. It can be used to help people that simply need reading glasses, and also those who have started to need bifocal or varifocal spectacle correction due to ageing changes in the eye. It can be used for people who are also short-sighted (myopia) or long-sighted (hyperopia) and who also may have astigmatism.
Jeffery J. Machat MD, FRCSC, DABO is an ophthalmologist in the United States and Canada specializing in surgical vision correction better known as refractive eye surgery. He is most known for being the Co-Founder of TLC Laser Eye Centers with Elias Vamvakas in 1993. The first TLC clinic was located in Windsor, Canada and treated thousands of patients from across all of North America. The clinic also hosted thousands of eye care specialists trying to learn about LASIK and PRK prior to US FDA approval which came three years later. Together Vamvakas and Machat built an incredible company of 83 LASIK clinics through both organic growth and strategic acquisition by May 2002 to become the largest provider of LASIK in North America. Dr. Machat pioneered not only LASIK but the concept of Optometric Comanagement throughout the 1990s, helping build a TLC network of over 14,000 referring optometrists by 2000. In 2005-2006, Machat spent time in Europe working to build Optical Express, helping David Moulsdale, owner and Founder, to transform the company from 300 optical stores into the leading provider of LASIK vision correction in Europe with 55 clinics in the span of 2 years.
Optimax is a laser eye treatment specialist based in Birmingham, England, owned by Russell Keith Ambrose. Optimax was established as one of the first private clinics to offer laser eye surgery.
Peter S. Hersh is an American ophthalmologist, researcher, and specialist in LASIK eye surgery, keratoconus, and diseases of the cornea. He co-authored the article in the journal Ophthalmology that presented the results of the study that led to the first approval by the U.S. Food and Drug Administration (FDA) of the excimer laser for the correction of nearsightedness in the United States. Hersh was also medical monitor of the study that led to approval of corneal collagen crosslinking for the treatment of keratoconus. He was the originator, in 2015, of CTAK for keratoconus, patent holder, and co-developer.
Sheraz Daya is a British ophthalmologist. Daya founded the Centre for Sight in 1996, and works in stem-cell research and sight restoration and correction surgery.
Dimitri Azar is an American ophthalmologist, professor, and businessman who leads Twenty Twenty Therapeutics, a joint venture established by Santen and Verily. Azar has held roles at Novartis and Verily, Alphabet's Life sciences research organization. He served as dean of the College of Medicine at the University of Illinois at Chicago (UIC) from 2011 to 2018.
Clear lens extraction, also known as refractive lensectomy, custom lens replacement or refractive lens exchange is a surgical procedure in which clear lens of the human eye is removed. Unlike cataract surgery, where cloudy lens is removed to treat cataract, clear lens extraction is done to surgically correct refractive errors such as high myopia. It can also be done in hyperopic or presbyopic patients who wish to have a multifocal IOL implanted to avoid wearing glasses. It is also used as a treatment for diseases such as angle closure glaucoma.
References
- ↑ "Shuttered Sight, Shattered Lives". Fort Worth Weekly. 20 February 2003. Archived from the original on 31 December 2008. Retrieved 19 May 2008.
- ↑ Blurred results – Pittsburgh Tribune-Review
- ↑ IMDb Resume for Ron Link (IV)
- ↑ http://www.nj.com/healthfit/ledger/index.ssf?/news/ledger/stories/021102lasik.html here
- ↑ New site details downsides of laser eye surgery http://www.post-gazette.com/healthscience/19991012hlasik4.asp
- ↑ FWWeekly: Feature: Shuttered Sight, Shattered Lives Archived 2008-12-31 at the Wayback Machine
- ↑ Brody, Jane E. (14 September 1999). "PERSONAL HEALTH; Promise and Risks of Laser Eye Surgery". The New York Times.
- ↑ KOMPAS Cyber Media/Health Edition
- ↑ Laser eye surgery – pros and cons
- ↑ Albuquerque Tribune Online: Science & Tech
- ↑ "Technology" (PDF). USA Today. Archived from the original (PDF) on 9 May 2006.
- ↑ "Eyeing The Risks". CBS News. 28 June 2000.
- ↑ BW Online | March 17, 2003 | Why Settle for 20/20?
- ↑ Portsmouth Herald Local News: LASIK: Reward of clear vision not without risk
- ↑ Worldandnation: Seeing LASIK's risks clearly
- ↑ Salon Health & Body | The LASIK "miracle"
- ↑ Why We're Here – Complications from LASIK and other refractive surgeries"
- ↑ "SurgicalEyes.org: Center, Clinics and Optometrists"
- ↑ "SurgicalEyes.org: Center, Clinics and Surgeons which treat Lasik complications"
- ↑ Accomplishments May 1999 to Now"
- ↑ Participants
- ↑ 403 Forbidden Archived 2017-05-15 at the Wayback Machine