This article needs more reliable medical references for verification or relies too heavily on primary sources. Please review the contents of the article and add the appropriate references if you can. Unsourced or poorly sourced material may be challenged and removed. Find sources: "Capsulorhexis" – news · newspapers · books · scholar · JSTOR(September 2018)
Capsulorhexis or capsulorrhexis, and the commonly used technique known as continuous curvilinear capsulorhexis (CCC), is a surgical technique used to remove the central anterior part of the capsule of the lens[1] from the eye during cataract surgery by shear and tensile forces. It generally refers to removal of the central part of the anterior lens capsule, but in situations like a developmental cataract a part of the posterior capsule is also removed by a similar technique.[2]
In order to remove a cataract by extracapsular techniques, the capsule of the lens must be opened. In earlier intracapsular cataract extractions, the whole lens and capsule were removed at the same time. This was done to prevent the inflammatory response to leftover lens material. Since it was all removed en-bloc, there was no residual lens material. With effective aspiration practically all the material can be removed while leaving the posterior capsule intact. This provides a barrier between the front and back chambers of the eye, and prevents the vitreous from moving forwards. It also provides the artificial intraocular lens with the ideal place to be located in the eye, away from contact with other structures yet securely held in place.[2]
Prior to the advent of the CCC, a "can opener" approach was used for capsulorhexis, with a small bent needle making small incisions around the anterior surface of the lens, forming a roughly continuous cut hole in the capsule that the lens could be removed through. However, the ragged edges were stress raisers and could promote a tear that could proceed outwards. A CCC when done correctly, does not have any edge notches, and forces applied to the capsule during surgery are better distributed and less likely to result in a tear.[2]
The usual method is to use the same bent needle to begin a tear in the capsule, and then guide the edge of the tear around the anterior surface with either the same needle or Utratas forceps. There are advantages and disadvantages to both approaches, and most surgeons will use both instruments as the situation requires.[2]
In children younger than 7 years, in addition to the anterior capsulorhexis, a posterior capsulorhex is commonly made, since the posterior capsule becomes cloudy even more commonly in children than adults. Since a simple office procedure using a Nd:YAG laser commonly performed on adults is difficult with a child (since they cannot sit still at the machine), it is better to deal with the posterior capsule at the time of surgery. Since the vitreous in children is much more stable, the loss of vitreous is less common (since as a solid it stays put), though often an anterior vitrectomy is still performed.[2][clarification needed]
Historyedit
Continuous curvilinear capsulorhexis is a technique that was pioneered by Howard Gimbel,[3] and is in common use as it has a low risk of initiating further outward tears in the capsule, and does not require complex or expensive instruments.[2]
Referencesedit
^"Capsulorrexis". Diccionario Médico (in Spanish). Retrieved 1 August 2018.
^ abcdefMohammadpour, Mehrdad; Erfanian, Reza; Karimi, Nasser (2012). "Capsulorhexis: Pearls and pitfalls". Saudi Journal of Ophthalmology. 26 (1): 3–40. doi:10.1016/j.sjopt.2011.10.007. ISSN 1319-4534. PMC3729482. PMID 23960966.
capsulorhexis, this, article, needs, more, reliable, medical, references, verification, relies, heavily, primary, sources, please, review, contents, article, appropriate, references, unsourced, poorly, sourced, material, challenged, removed, find, sources, new. This article needs more reliable medical references for verification or relies too heavily on primary sources Please review the contents of the article and add the appropriate references if you can Unsourced or poorly sourced material may be challenged and removed Find sources Capsulorhexis news newspapers books scholar JSTOR September 2018 Capsulorhexis or capsulorrhexis and the commonly used technique known as continuous curvilinear capsulorhexis CCC is a surgical technique used to remove the central anterior part of the capsule of the lens 1 from the eye during cataract surgery by shear and tensile forces It generally refers to removal of the central part of the anterior lens capsule but in situations like a developmental cataract a part of the posterior capsule is also removed by a similar technique 2 CapsulorhexisOther namescapsulorrhexis continuous curvilinear capsulorrhexis capsulorhexis capsulotomy capsulectomy continuous circular capsulorrhexis capsulorhexis capsulotomy capsulectomyICD 9 CM13MeSHD019923 edit on Wikidata In order to remove a cataract by extracapsular techniques the capsule of the lens must be opened In earlier intracapsular cataract extractions the whole lens and capsule were removed at the same time This was done to prevent the inflammatory response to leftover lens material Since it was all removed en bloc there was no residual lens material With effective aspiration practically all the material can be removed while leaving the posterior capsule intact This provides a barrier between the front and back chambers of the eye and prevents the vitreous from moving forwards It also provides the artificial intraocular lens with the ideal place to be located in the eye away from contact with other structures yet securely held in place 2 Prior to the advent of the CCC a can opener approach was used for capsulorhexis with a small bent needle making small incisions around the anterior surface of the lens forming a roughly continuous cut hole in the capsule that the lens could be removed through However the ragged edges were stress raisers and could promote a tear that could proceed outwards A CCC when done correctly does not have any edge notches and forces applied to the capsule during surgery are better distributed and less likely to result in a tear 2 The usual method is to use the same bent needle to begin a tear in the capsule and then guide the edge of the tear around the anterior surface with either the same needle or Utratas forceps There are advantages and disadvantages to both approaches and most surgeons will use both instruments as the situation requires 2 In children younger than 7 years in addition to the anterior capsulorhexis a posterior capsulorhex is commonly made since the posterior capsule becomes cloudy even more commonly in children than adults Since a simple office procedure using a Nd YAG laser commonly performed on adults is difficult with a child since they cannot sit still at the machine it is better to deal with the posterior capsule at the time of surgery Since the vitreous in children is much more stable the loss of vitreous is less common since as a solid it stays put though often an anterior vitrectomy is still performed 2 clarification needed History editContinuous curvilinear capsulorhexis is a technique that was pioneered by Howard Gimbel 3 and is in common use as it has a low risk of initiating further outward tears in the capsule and does not require complex or expensive instruments 2 References edit Capsulorrexis Diccionario Medico in Spanish Retrieved 1 August 2018 a b c d e f Mohammadpour Mehrdad Erfanian Reza Karimi Nasser 2012 Capsulorhexis Pearls and pitfalls Saudi Journal of Ophthalmology 26 1 3 40 doi 10 1016 j sjopt 2011 10 007 ISSN 1319 4534 PMC 3729482 PMID 23960966 Gimbel HV Neuhann T January 1991 Continuous curvilinear capsulorhexis J Cataract Refract Surg 17 1 110 1 doi 10 1016 s0886 3350 13 81001 2 PMID 2005552 S2CID 3146413 Retrieved from https en wikipedia org w index php title Capsulorhexis amp oldid 1218517922, wikipedia, wiki, book, books, library,
