J Korean Ophthalmol Soc.  2016 Jun;57(6):905-916. 10.3341/jkos.2016.57.6.905.

Comparison of Intraocular Lens Calculation Formulas Measured by Immersion-Type A-Scan Ultrasound and Partial Coherence Interferometry

• Yun IS
• Park A
• Choi SY
• Yang HS

• KMID: 2290492
• DOI: http://doi.org/10.3341/jkos.2016.57.6.905

Abstract

PURPOSE
To report the accuracy of intraocular lens (IOL) formulas according to axial length, anterior chamber depth, and mean corneal curvature when performing biometry with an immersion type A-scan with mannual keratomery and an IOL Master®.
METHODS
Retrospective medical chart reviews were carried out for 82 eyes of 65 patients who underwent cataract surgery performed by a single surgeon. Biometry was performed using IOL Master®, mannual keratometry, and immersion type A-scan ultrasound in sequence. Prediction diopter was obtained using Sanders-Retzlaff-Kraff/Theoretical (SRK-T) and Holladay 1 formulas calculated with the biometric value measured by mannual keratomery and A-scan, and using SRK-T and, Holladay 2 formulas with IOL Master®. The final refractive outcome was determined as manifested refraction at least 7 weeks after the surgery, and it was compared with the preoperative prediction dipoter (D) of the IOL formulas.
RESULTS
Mean axial length and mean keratomtric measurements as determined by A-scan with mannual keratomery showed significant statistical differences from those of IOL Master®. However, there was no difference in postoperative mean absolute error between biometric measurements, or among formulas according to axial length, anterior chamber depth, or mean corneal curvature. However, the percentage of actual refraction within ±0.50 D of the intended refraction was dirrerent among the four formalas according to axial length, anterior chamber dept, mean corneal curvature.
CONCLUSIONS
Biometry measurement using the immersion-type A-scan with mannual keratomery is as accurate as that using IOL Master® for predicting the postoperative refractive state of cataract surgery. However, it is suggested that the best IOL formula be chosen according to axial length, anterior chamber depth, and mean corneal curvature.

Keyword

Immersion-type A-scan ultrasound; Intraocular lens formula; Manual Keratometry; Partial coherence interferometry

MeSH Terms

Anterior Chamber
Biometry
Cataract
Humans
Immersion
Interferometry*
Lenses, Intraocular*
Retrospective Studies
Ultrasonography*

Figure

• 

  Figure 1. Mean numerical error in subgroup. Prediction errors of intraocular lens (IOL) calculation formulas according to the axial length (A), anterior chamber depth (B), mean corneal curvature (C). A/T = Sanders-Retzlaff-Kraff/Theoretical (SRK-T) (A-scan); A/H1 = Holladay 1 (A-scan); M/T = SRK-T (IOL Master®); M/H2 = Holladay 2 (IOL Master®).

• 

  Figure 2. Correlation between final spherical equivalent and intraocular lens (IOL) calculation formulas according to the axial length. (A) There are statically significant correlation between the IOL calculation formulas and the axial length in Sanders-Retzlaff-Kraff/Theoretical (SRK-T) (A-scan) formulas (p < 0.05). (B-D) No statically significant correlation between the IOL calculation formulas and the axial length in Holladay 1 (A-scan), SRK-T (IOL Master®) and Holladay 2 (IOL Master®) formulas. SE = spherical equivalent; A/T = SRK-T (A-scan); A/H1 = Holladay 1 (A-scan); D = diopter; M/T = SRK-T (IOL Master®); M/H2 = Holladay 2 (IOL Master®).

• 

  Figure 3. Correlation between final spherical equivalent and intraocular lens (IOL) calculation formulas according to the anterior chamber depth. (A-D)There are no statically significant correlation between the IOL calculation formulas and the anterior chamber depth in all formulas. SE = spherical equivalent; A/T = Sanders-Retzlaff-Kraff/Theoretical (SRK-T) (A-scan); A/H1 = Holladay 1 (A-scan); D = diopter; M/T = SRK-T (IOL Master®); M/H2 = Holladay 2 (IOL Master®).

• 

  Figure 4. Correlation between final spherical equivalent and intraocular lens (IOL) calculation formulas according to the mean corneal curvature. (A, C) There are statically significant correlation between the IOL calculation formulas and the anterior chamber depth in Sanders-Retzlaff-Kraff/Theoretical (SRK-T) (A-scan) and SRK-T (IOL Master®) formulas (p < 0.05). (B, D) No statically significant correlation between the IOL calculation formulas and the anterior chamber depth in Holladay 1 (A-scan) and Holladay 2 (IOL Master®) formulas. SE = spherical equivalent; A/T = SRK-T (A-scan); A/H1 = Holladay 1 (A-scan); D = diopter; M/T = SRK-T (IOL Master®); M/H2 = Holladay 2 (IOL Master®).

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