title: Supraciliary contraction segments: a new method for the treatment of presbyopia.
abstract: OBJECTIVE
  To evaluate the safety and effectiveness of supraciliary contraction segment implants (SCSIs) for the treatment of presbyopia.
  
  
  METHODS
  This prospective, non-comparative study comprised 10 eyes from five phakic and emmetropic 50-year-old subjects. Preoperative and postoperative near and distance visual acuity, topography, axial length, pachymetry, and intraocular pressure were analyzed. A 5.32-mm long and 0.85-mm thick piece of polymethyl methacrylat (PMMA) and a 5.32-mm long or 0.55-mm thick dried hydrophilic SCSI were placed within the scleral tunnels that were created 2 mm away from the limbus. The 500-550 m deep tunnels were parallel to the limbus and four segments were implanted per eye. The SCSIs were entirely placed at a depth of approximately 85% in the sclera.
  
  
  RESULTS
  The uncorrected distance visual acuity was similar before and after the surgery (0.00 logMAR). The monocular mean uncorrected near visual acuity (UNVA) was 0.5 ± 0.0 before surgery, 0.12 ± 0.10 logMAR at 1 month after surgery, 0.16 ± 0.18 logMAR at 3 months after surgery, and 0.29 ± 0.16 logMAR at the 18-month follow-up.
  
  
  CONCLUSIONS
  Despite obtaining satisfactory results at 6 months after the surgery, a follow-up of the SCSI intervention at 18 months revealed a regression of the early post-op UNVA improvement caused by a progressive outward movement of SCSIs.
authors.affiliation: Department of Ophthalmology, Maltepe University School of Medicine, Istanbul, Turkey.
authors.forename: Zeki
authors.initials: Z
authors.lastname: Tunc
authors.forename: Firat
authors.initials: F
authors.lastname: Helvacioglu
authors.forename: Yesim
authors.initials: Y
authors.lastname: Ercalik
authors.forename: George
authors.initials: G
authors.lastname: Baikoff
authors.forename: Sadik
authors.initials: S
authors.lastname: Sencan
mesh_terms: D002924:Ciliary Body; D003319:Corneal Stroma / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011305:Presbyopia / Q000503:physiopathology / Q000601:surgery*; D011446:Prospective Studies; D019736:Prostheses and Implants; D012029:Refraction, Ocular; D054140:Refractive Surgical Procedures / Q000379:methods*; D013997:Time Factors; D016896:Treatment Outcome; D014792:Visual Acuity
references.citation: Ann Ophthalmol. 1992 Dec;24(12):445-7, 452
references.pmid: 1485739
references.citation: Ophthalmology. 2001 Dec;108(12):2165-71
references.pmid: 11733253
references.citation: J Cataract Refract Surg. 2006 Nov;32(11):1792-8
references.pmid: 17081859
references.citation: Trans Am Ophthalmol Soc. 1997;95:261-7; discussion 267-70
references.pmid: 9440174
references.citation: Ann Ophthalmol. 1993 Jan;25(1):5-9
references.pmid: 8427491
references.citation: Curr Opin Ophthalmol. 2006 Feb;17(1):12-8
references.pmid: 16436919
references.citation: Ophthalmology. 1999 May;106(5):873-7
references.pmid: 10328383
references.citation: J Cataract Refract Surg. 2010 Feb;36(2):235-41
references.pmid: 20152603
references.citation: J Cataract Refract Surg. 2004 Jul;30(7):1445-53
references.pmid: 15210221
references.citation: Invest Ophthalmol Vis Sci. 1999 May;40(6):1162-9
references.pmid: 10235549
references.citation: Graefes Arch Clin Exp Ophthalmol. 1999 May;237(5):361-71
references.pmid: 10333101
references.citation: Ophthalmology. 2000 Feb;107(2):221-2
references.pmid: 10690808
references.citation: Sci Am. 1988 Jul;259(1):92-9
references.pmid: 3070746
references.citation: Vision Res. 1998 Jan;38(2):209-29
references.pmid: 9536350
references.citation: Invest Ophthalmol Vis Sci. 1997 Mar;38(3):569-78
references.pmid: 9071209
references.citation: Am J Ophthalmol. 2000 Oct;130(4):521-3
references.pmid: 11024428
references.citation: J Refract Surg. 1999 Sep-Oct;15(5):604
references.pmid: 10504089
references.citation: Am J Ophthalmol. 2002 Dec;134(6):808-15
references.pmid: 12470747
references.citation: J Cataract Refract Surg. 2004 Mar;30(3):696-701
references.pmid: 15050270