Intraoperative correction of induced astigmatism after spherical correction of hyperopia with conductive keratoplasty

Shamim A. Haji, Krista Ramonas, Natalia Potapova, George Wang, Penny Asbell

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Purpose. To evaluate the treatment of surgically induced astigmatism intraoperatively during conductive keratoplasty (CK) for correcting hyperopia. Methods. Conductive keratoplasty uses radiofrequency energy applied to the peripheral corneal stroma to shrink the collagen and alter the central cornea to correct hyperopia. Nineteen consecutive patients (27 eyes) who underwent CK for hyperopia and were treated intraoperatively for induced astigmatism were examined. By using automated keratometric readings taken during the procedure, additional spots were applied at the minus cylinder or flat axis at the 7-mm zone until the intraoperative astigmatism was 2 diopters (D) or less. Results. The intraoperative treatment reduced the astigmatism by an average of 2.30 ± 1.32 D (P=0.00001). The mean induced astigmatism was 3.33 ± 0.14 D for eyes that received eight spots, 4.12 ± 1.13 D for eyes that received 16 spots, 4.43 ± 0.82 D for eyes that received 24 spots, and 4.60 ± 1.08 D for eyes that received 32 spots. Additional spots reduced astigmatism in most patients to less than 2 D. Conclusions. Intraoperative treatment of astigmatism through the addition of more spots at the minus cylinder or flat axis reduced the degree of induced astigmatism. Surgically induced astigmatism was observed more frequently in patients who received 32 treatment spots and 6-mm treatment zone application.

Original languageEnglish (US)
Pages (from-to)76-79
Number of pages4
JournalEye and Contact Lens
Volume31
Issue number2
DOIs
StatePublished - Mar 1 2005

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Hyperopia
Corneal Transplantation
Astigmatism
Corneal Stroma
Therapeutics
Cornea
Reading
Collagen

All Science Journal Classification (ASJC) codes

  • Ophthalmology

Cite this

Intraoperative correction of induced astigmatism after spherical correction of hyperopia with conductive keratoplasty. / Haji, Shamim A.; Ramonas, Krista; Potapova, Natalia; Wang, George; Asbell, Penny.

In: Eye and Contact Lens, Vol. 31, No. 2, 01.03.2005, p. 76-79.

Research output: Contribution to journalArticle

Haji, Shamim A. ; Ramonas, Krista ; Potapova, Natalia ; Wang, George ; Asbell, Penny. / Intraoperative correction of induced astigmatism after spherical correction of hyperopia with conductive keratoplasty. In: Eye and Contact Lens. 2005 ; Vol. 31, No. 2. pp. 76-79.
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