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Photorefractive keratectomy for hyperopia using an erodible disc and axicon lens: 2-year results.

AbstractBACKGROUND:
This paper presents the results over a 2-year follow-up of the first human trial of photorefractive keratectomy (PRK) for correction of hyperopia using an erodible disc excimer laser delivery system (Summit) coupled to an axicon lens.
METHODS:
We treated 25 eyes of 21 patients for a mean correction of +3.38 +/- 0.97 D (range, +1.00 to +4.00 D). The hyperopic correction was made using an erodible disc inserted on the laser optical pathway; an axicon lens was then used to create a blend transition zone. Eyes were evaluated at 1, 3, 6, and 12 months after surgery. For a smaller series of 11 eyes, we also present 24-month results.
RESULTS:
Mean refractive error 1 month after treatment (25 eyes) was -2.35 +/- 1.55 D (range, +1.00 to -6.50 D). Eight eyes (32%) had a spectacle-corrected visual acuity loss greater than 1 line. Twelve months after treatment, mean spherical equivalent refraction was -0.47 +/- 0.80 D (range, +1.25 to -2.25 D). Nineteen eyes showed an improvement (range, 3 to 8 lines) in uncorrected distance visual acuity and 23 showed improvement in uncorrected vision at reading distance (1 to 7 lines).
CONCLUSION:
This technique proved effective in reducing hyperopia, but predictability must be demonstrated in a larger treatment group. Safety was confirmed by the absence of delayed reepithelialization and the absence of spectacle-corrected visual acuity loss greater than 1 line at 1 year after surgery.
AuthorsF Carones, R Brancato, A Morico, L Vigo, E Venturi, P G Gobbi
JournalJournal of refractive surgery (Thorofare, N.J. : 1995) (J Refract Surg) 1998 Sep-Oct Vol. 14 Issue 5 Pg. 504-11 ISSN: 1081-597X [Print] United States
PMID9791816 (Publication Type: Clinical Trial, Controlled Clinical Trial, Journal Article)
Topics
  • Adult
  • Cornea (surgery)
  • Corneal Topography
  • Female
  • Follow-Up Studies
  • Humans
  • Hyperopia (surgery)
  • Lasers, Excimer
  • Male
  • Middle Aged
  • Photorefractive Keratectomy
  • Refraction, Ocular
  • Treatment Outcome
  • Visual Acuity

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