Clinical Outcomes of Toric Iris-fixated Phakic Intraocular Lens: Six-Month Follow-up

Jae Lim Chung; Sun Woong Kim; Tae-im Kim; Hyung Keun Lee; Eung Kweon Kim

doi:10.3341/jkos.2008.49.1.48

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Chung, Kim, Kim, Lee, and Kim: Clinical Outcomes of Toric Iris-fixated Phakic Intraocular Lens: Six-Month Follow-up

Original Article

J Korean Ophthalmol Soc 2008;49(1):48-56.

Published online: 3 August 2008

DOI: https://doi.org/10.3341/jkos.2008.49.1.48

Clinical Outcomes of Toric Iris-fixated Phakic Intraocular Lens: Six-Month Follow-up

Jae Lim Chung, M.D., Sun Woong Kim, M.D., Tae-im Kim, M.D., Hyung Keun Lee, M.D., Eung Kweon Kim, M.D.

The Institute of Vision Research Department of Ophthalmology, College of Medicine, Yonsei University, Seoul, Korea

Address reprint requests to Eung Kweon Kim. M.D. Department of Ophthalmology, Severance Hospital, College of Medicine, Yonsei University #134 Shinchon-dong, Seodaemun-gu, Seoul 120-752, Korea Tel: 82-2-2228-3577, Fax: 82-2-312-0541, E-mail: eungkkim@yumc.yonsei.ac.kr

Received 4 January 2007 Accepted 4 September 2007

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To evaluate the clinical results of toric iris-fixated phakic intraocular lens (Artisan^®) implantation for the correction of myopia with astigmatism.

Methods

Sixteen eyes of 11 patients underwent toric Artisan^® lens implantation between April 2004 and February 2006 and were followed up for 6 months. We analyzed visual acuity, refraction, change in astigmatism, efficacy, safety, predictability, and complications.

Results

Among 11 patients, 4 were men and 7 were women, with an average age of 30.9 years. The preoperative mean uncorrected visual acuity (UCVA) was 0.02, except for 1 eye with post-LASIK astigmatism (0.4); the mean spherical equivalent refraction was -11.06±4.11D; and the mean astigmatism was -2.91±0.91D. At postoperative 1 month, 3 months, and 6 months, UCVA was more than 0.8 in 31%, 69%, 81% of eyes and more than 0.5 in 94%, 94%, 100% of eyes, respectively. Mean astigmatism decreased to -2.28, -1.37, and -0.73 and the spherical equivalent refraction was within 1.0D in 56%, 81%, 88% of eyes, respectively. For the vector analysis of astigmatic change, a doubled-angle scatterplot revealed that the postoperative 6 month data were located mainly at the center of the plot, which indicated a considerable reduction of astigmatism by magnitude and axis. At postoperative 6 months, the efficacy and safety indices were 99.0% and 114.7%, respectively. Complications included transient elevation of intraocular pressure in 1 eye and nighttime glare or halo in 3 eyes.

Conclusions

Although the patient population was small, six-month clinical results demonstrate that the implantation of the toric Artisan lens was safe, reliable, and effective for correcting high myopia with astigmatism.

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Keywords: Artisan, Intraocular lens, Iris-fixated, Phakic, Toric

References

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Figure 1.

Postoperative uncorrected visual acuity (UCVA).

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Figure 2.

Reduction in total manifest refraction during preoperative versus postoperative period. Horizontal lines indicate medians and 1st and 3rd quartiles. Vertical extensions indicate 10th/90th percentile values.

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Figure 3.

Reduction in total astigmatism during preoperative versus postoperative period. Horizontal lines indicate medians and 1st and 3rd quartiles. Vertical extensions indicate 10th/90th percentile values.

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Figure 4.

Predictability of postoperative spherical equivalent (SE)

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Figure 5.

Scattergram of achieved refraction (spherical equivalent) against intended refraction at 6 months. The diagonal line show equality and overcorrection and undercorrection by 1 diopter; D=diopters.

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Figure 6.

Doubled‐ angle scatterplot showing a polar plot of the preoperative spectacle plane refractive astigmatism at a vertex distance of 12 mm by using the value of cylinder for the magnitude and the axis of the astigmatism for the angle. The 0° and 180° locations are the same, just as 0° and 180° are the same for the axis of refraction.

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Figure 7.

Doubled‐ angle scatterplot showing a polar plot of the 6‐ month‐ postoperative spectacle plane refractive astigmatism at a vertex distance of 12 mm by using the value of cylinder for the magnitude and the axis of the astigmatism for the angle. The postoperative data are located at the center of the plot, which illustrates the great reduction of preoperative astigmatism by the implantation of toric phakic intraocular lenses.

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Table 1.

Summary of preoperative patient data for patients undergoing implantation of toric phakic intraocular lenses

Characteristics	Value
Number of eyes	16
Age (years)
Mean	30.9
Range	20∼50
Sex
Men (eyes)	4
Women (eyes)	7
Right eyes	6
Left eyes	10
Spherical equivalent (D)
Mean±SD	-11.06±4.11
Range	-18.25∼1.63
Sphere (D)
Mean±SD	-9.61±4.22
Range	-17.25∼3.50
Cylinder (D)
Mean±SD	-2.91±0.91
Range	-5.50∼-1.75
TPIOL power (D)
Mean±SD	-10.09±4.41
Range	-16.50∼4.50

D=diopters; SD=standard deviation; TPIOL=toric phakic intraocular lens.

Table 2.

Preoperative and postoperative mean uncorrected visual acuity, best spectacle corrected visual acuity, spherical equivalent and cylinder

	Preoperative	1 month	3 months	6 months
UCVA (M±SD)	0.05±0.10	0.72±0.25	0.82±0.23	0.92±0.19
> 0.5 (%)	0	94	94	100
> 0.8 (%)	0	31	69	81
> 1.0 (%)	0	19	19	44
BSCVA (M±SD)	0.93±0.09			1.06±0.14
SE (M±SD)	‐11.06±4.11	‐1.05±0.61	‐0.82±0.62	‐0.62±0.45
<±0.5D (%)	0	25	31	31
<±1.0D (%)	0	56	81	88
<±1.5D (%)	0	88	88	100
Cylinder (M±SD)	‐2.91±0.91	‐2.28±2.09	‐1.37±1.54	‐0.73±0.70

UCVA=uncorrected visual acuity; M=mean; SD=standard deviation; BSCVA=best spectacle‐ corrected visual acuity; SE=spherical equivalent.

Table 3.

Preoperative and postoperative results of two patients who received Artisan lens in the right eye and toric Artisan lens in the left eye

	Patient 1		Patient 2
	OD	OS	OD	OS
Preop RE	-16.00 = -1.50ax180	-17.25 = -2.00ax180	‐11.25=‐1.75ax170	-9.50 = -3.00ax10
Preop BSCVA	0.6	0.7	0.9	0.9
Artisan Lens Used	-16.50	-16.50 = -2.00ax180	‐12.50	-10.00 = -3.00ax10
1 mo UCVA	0.5	0.5	0.7	0.7
3 mo UCVA	0.5	0.6	0.8	0.8
6 mo UCVA	0.6	0.7	0.8	0.9
6 mo RE	-1.00 = -1.50ax180	-0.50 = -0.75ax180	‐0.75=‐1.25ax170	-0.50 = -0.50ax10

RE=refractive error; BSCVA=best spectacle corrected visual acuity; UCVA=uncorrected visual acuity; M=mean; SD=standard deviation.

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