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New equivalent keratometry reading calculation with a rotating Scheimpflug camera for intraocular lens power calculation after myopic corneal surgery.

Publication ,  Journal Article
Seo, KY; Im, CY; Yang, H; Kim, T-I; Kim, EK; Kim, T; Nam, SM
Published in: J Cataract Refract Surg
November 2014

PURPOSE: To calculate the keratometric (K) reading in corneas modified by myopic keratorefractive surgery using the total corneal refractive power (TCRP) of the Pentacam rotating Scheimpflug camera. SETTING: University hospitals and private clinics, South Korea DESIGN: Evaluation of diagnostic test or technology. METHODS: The study comprised healthy eyes, eyes having myopic keratorefractive surgery, and eyes having cataract surgery after myopic keratorefractive surgery. The conversion equation from the TCRP in the central 4.0 mm zone (TCRP4) to a K reading was derived in normal corneas. This equation was rechecked and its application range extended in corneas modified by myopic keratorefractive surgery. Then, the predictability of the TCRP method, combining the K reading derived from the TCRP4 and the Holladay 2 formula, was evaluated in a case series of cataract surgery patients who had previous myopic keratorefractive surgery. RESULTS: The K reading derived from the TCRP4 was obtained by adding 0.7 diopter (D). This conversion factor was applicable after myopic keratorefractive surgery because changes in TCRP4 were equal to changes in refraction in the 4.0 mm zone. The TCRP method predicted intraocular lens power within ± 0.5 D in 83% and within ± 1.0 D in 94% of eyes having cataract surgery after myopic keratorefractive surgery. CONCLUSION: The TCRP4 of the rotating Scheimpflug camera was successfully converted into the equivalent K reading, and the TCRP method showed good predictability in corneas modified by myopic keratorefractive surgery. FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.

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Published In

J Cataract Refract Surg

DOI

EISSN

1873-4502

Publication Date

November 2014

Volume

40

Issue

11

Start / End Page

1834 / 1842

Location

United States

Related Subject Headings

  • Young Adult
  • Photography
  • Phacoemulsification
  • Optics and Photonics
  • Ophthalmology & Optometry
  • Myopia
  • Middle Aged
  • Male
  • Lenses, Intraocular
  • Lens Implantation, Intraocular
 

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Seo, K. Y., Im, C. Y., Yang, H., Kim, T.-I., Kim, E. K., Kim, T., & Nam, S. M. (2014). New equivalent keratometry reading calculation with a rotating Scheimpflug camera for intraocular lens power calculation after myopic corneal surgery. J Cataract Refract Surg, 40(11), 1834–1842. https://doi.org/10.1016/j.jcrs.2013.11.044
Seo, Kyoung Yul, Chan Young Im, Hun Yang, Tae-im Kim, Eung Kweon Kim, Terry Kim, and Sang Min Nam. “New equivalent keratometry reading calculation with a rotating Scheimpflug camera for intraocular lens power calculation after myopic corneal surgery.J Cataract Refract Surg 40, no. 11 (November 2014): 1834–42. https://doi.org/10.1016/j.jcrs.2013.11.044.
Seo KY, Im CY, Yang H, Kim T-I, Kim EK, Kim T, et al. New equivalent keratometry reading calculation with a rotating Scheimpflug camera for intraocular lens power calculation after myopic corneal surgery. J Cataract Refract Surg. 2014 Nov;40(11):1834–42.
Seo, Kyoung Yul, et al. “New equivalent keratometry reading calculation with a rotating Scheimpflug camera for intraocular lens power calculation after myopic corneal surgery.J Cataract Refract Surg, vol. 40, no. 11, Nov. 2014, pp. 1834–42. Pubmed, doi:10.1016/j.jcrs.2013.11.044.
Seo KY, Im CY, Yang H, Kim T-I, Kim EK, Kim T, Nam SM. New equivalent keratometry reading calculation with a rotating Scheimpflug camera for intraocular lens power calculation after myopic corneal surgery. J Cataract Refract Surg. 2014 Nov;40(11):1834–1842.
Journal cover image

Published In

J Cataract Refract Surg

DOI

EISSN

1873-4502

Publication Date

November 2014

Volume

40

Issue

11

Start / End Page

1834 / 1842

Location

United States

Related Subject Headings

  • Young Adult
  • Photography
  • Phacoemulsification
  • Optics and Photonics
  • Ophthalmology & Optometry
  • Myopia
  • Middle Aged
  • Male
  • Lenses, Intraocular
  • Lens Implantation, Intraocular