J Korean Ophthalmol Soc.  2008 Aug;49(8):1248-1255. 10.3341/jkos.2008.49.8.1248.

Wavefront and Visual Function Analysis After Aspherical and Spherical Intraocular Lenses Implantation

• Ahn H
• Kim SW
• Kim EK
• Kim TI

• KMID: 2211728
• DOI: http://doi.org/10.3341/jkos.2008.49.8.1248

Abstract

PURPOSE: To compare postoperative wavefront aberration and visual functions between aspherical Tecnis Z9003, a new acrylic aspheric intraocular lens (IOL), and spherical AcrySof SA60AT IOL.
METHODS
Fifty patients (56 eyes) who underwent cataract extraction and were implanted with spherical or aspherical IOLs were randomly evaluated by wavefront analysis, including an examination of spherical aberration and higher-order aberrations using two different types of aberrometers (ray tracing and automatic retinoscope), manifested refraction, a contrast sensitivity test, and modulation transfer function (MTF), three months after surgery. RESULT: There were no statistically significant differences of spherical equivalent and best-corrected visual acuity between the two different IOL groups. However, the aspherical IOL group showed less spherical aberration and better contrast sensitivity and MTF than the spherical IOL group.
CONCLUSIONS
Tecnis Z9003 could compensate for positive spherical aberrations of the cornea and improve contrast sensitivity and MTF, thereby improving visual function.

Keyword

Aspheric intraocular lens; Contrast sensitivity; Modulation transfer function; Spherical aberration; Visual function

MeSH Terms

Cataract Extraction
Contrast Sensitivity
Cornea
Humans
Lenses, Intraocular
Visual Acuity

Figure

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  Figure 1. Ocular and internal aberrations of spherical and aspherical IOL-implanted groups at 4-mm pupil zone † RMS Total=root mean measured by iTrace. (* p<0.05; square of total aberrations; ‡ RMS HoA=root mean square of § 7th total higher-order aberrations from 3rd to 6th order; ＃ SA=spherical ∏8th coma aberration; coma aberration; aberration)

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  Figure 2. Ocular and internal aberrations of spherical and aspherical IOL implanted groups at 6-mm pupil zone †: RMS Total=root mean measured by iTrace. (* p<0.05; ‡ RMS HoA=Root mean square square of total aberrations; § 7th of total higher order aberrations from 3rd to 6th order; ＃ SA=spherical ∏8th coma aberration; coma aberration, aberration)

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  Figure 3. Ocular and internal aberrations of spherical and aspherical IOL implanted groups at 4 mm pupil zone measured by OPD scan. (* p<0.05; RMS Total=root mean square of total aberrations; ‡ RMS HoA=root mean square of § 7th total higher order aberrations from 3rd to 6th order; ＃ SA=spherical ∏8th coma aberration; coma aberration; aberration).

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  Figure 4. Ocular and internal aberrations of spherical and aspherical IOL implanted groups at 6-mm pupil zone measured by OPD scan. (* p<0.05; † RMS Total = root mean ‡RMS HoA = root mean square square of total aberrations; § 7th of total higher order aberrations from 3rd to 6th order; ＃ SA=spherical ∏8th coma aberration; coma aberration; aberration).

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  Figure 5. Contrast sensitivity test result of spherical and aspherical IOL-implanted groups in mesopic condition (* p<0.05).

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  Figure 6. Contrast sensitivity test result of spherical and aspherical IOL-implanted groups in photopic condition (* p<0.05).

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  Figure 7. Modulation transfer function (MTF) of spherical and aspherical IOL implanted groups at 6-mm pupil zone (* p<0.05).

Reference

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