July 2018
Volume 59, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2018
Accuracy of intraocular lens power calculation in eyes with keratoconus
Author Affiliations & Notes
  • Takashi Kojima
    Ophthalmology, Japanese Red Cross Gifu Hospital, Gifu, Japan
    Ophthalmology, Keio Univ School of Medicine, Nagoya, AICHI, Japan
  • Rie Horai
    Ophthalmology, Nagoya Eye Clinic, Nagoya, - Non US -, Japan
  • Naoki Isogai
    Ophthalmology, Nagoya Eye Clinic, Nagoya, - Non US -, Japan
  • Tomoaki Nakamura
    Ophthalmology, Nagoya Eye Clinic, Nagoya, - Non US -, Japan
  • AKENO TAMAOKI
    Ophthalmology, JCHO Chukyo Hospital, Nagoya, Japan
  • Kazuo Ichikawa
    Chukyo eye clinic, Nagoya, Japan
  • Footnotes
    Commercial Relationships   Takashi Kojima, Alcon (I), Johnson & Johnson (I), Otsuka pharmaceutical (I), Santen pharmaceutical (I); Rie Horai, None; Naoki Isogai, None; Tomoaki Nakamura, Carl Zeiss Meditec (I), Johnson & Johnson (I), Otsuka Pharmaceutical (I), Santen Pharmaceutical (I), Staar Surgical (I); AKENO TAMAOKI, Alcon (I), Carl Zeiss Meditec (I), NIDEK (I), Santec (I), TOMEY (I); Kazuo Ichikawa, Alcon (I), Carl Zeiss Meditec (I), Kowa (I), Santen Pharmaceutical (I)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science July 2018, Vol.59, 2209. doi:
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      Takashi Kojima, Rie Horai, Naoki Isogai, Tomoaki Nakamura, AKENO TAMAOKI, Kazuo Ichikawa; Accuracy of intraocular lens power calculation in eyes with keratoconus. Invest. Ophthalmol. Vis. Sci. 2018;59(9):2209.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : To evaluate intraocular lens (IOL) power calculation in eyes with keratoconus.

Methods : Cases with a diagnosis of keratoconus and a history of cataract surgery, at 3 surgery centers, were retrospectively reviewed using patient charts. Accordingly, 27 eyes of 46 patients (mean age, 61.4±15.5 years) were included in the study. The average K value and axial length were 48.4±4.6 D and 25.4±1.8 mm, respectively. Various K values, IOL Master K value, corneal topography based third ring power(ring 3), average central corneal power over the central 3.0 mm based on corneal topography (ACCP 3 mm), total corneal power measured using anterior optical coherence tomography (Real power), average central corneal power over the central 3.0 mm calculated using OCT (Real ACCP) were used for IOL calculation. For each K value, the A-constant was optimized using the data from patients with normal cornea. The SRK/T formula was applied for the IOL power calculation. The postoperative refractive error for each K applied for IOL calculation was estimated using the refractive error 3 months after surgery. Friedman test was performed for statistical analyses, and Dunn’s multiple comparison test as a post-hoc test. A p value less than 5% was considered to be statistically significant.

Results : The postoperative refractive error (median, minimum, and maximum values) in the IOL Master K, ring 3, ACCP, Real power, Real ACCP were respectively 0.42, -3.64, 8.99; 0.43, -1.8, 7.66; 0.16, -2.35, 7.53; -0.6, -3.32, 2.56; -0.82, -3.27, 2.2. There were significant differences between the groups (p<0.0001). The absolute postoperative refractive error (median, maximum values) in IOL Master K, Ring 3, ACCP, Real power, Real ACCP were respectively 0.71, 8.99; 0.82, 7.66; 0.62, 7.53; 0.94, 3.3; 1.04, 3.27. There were no significant differences between the groups (p=0.42).

Conclusions : We could not determine the K value suitable for IOL power calculation in keratoconus eyes. However, variation in postoperative refractive error tended to be small when K value calculated with the total corneal power was used. Moreover, postoperative refractive error showed a hyperopic shift when K value calculated only with anterior corneal power was used, and a myopic shift with K value derived from total corneal power.

This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.

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