Impact of environmental temperature on optical power properties of intraocular lenses

Bennett N. Walker; Robert H. James; Don Calogero; Ilko K. Ilev

doi:10.1364/AO.53.000453

Applied Optics
Vol. 53,
Issue 3,
pp. 453-457
(2014)
•https://doi.org/10.1364/AO.53.000453

Impact of environmental temperature on optical power properties of intraocular lenses

Bennett N. Walker, Robert H. James, Don Calogero, and Ilko K. Ilev

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Bennett N. Walker, Robert H. James, Don Calogero, and Ilko K. Ilev, "Impact of environmental temperature on optical power properties of intraocular lenses," Appl. Opt. 53, 453-457 (2014)

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Table of Contents Category
- Instrumentation, Measurement, and Metrology
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About this Article
History
- Original Manuscript: November 4, 2013
- Manuscript Accepted: December 11, 2013
- Published: January 16, 2014
Virtual Issues
Virtual Journal for Biomedical Optics Vol. 9, Iss. 3

Abstract

Optical power properties of lenses and materials in general can be influenced by thermal changes of the material and surrounding medium. In the case of an intraocular lens (IOL) implant, the spherical power (SP), cylinder power, (CP), astigmatism, and spherical aberration are the critical fundamental properties that can significantly impact its efficacy. Directly evaluating how changes in temperature can affect these optical properties may show the importance of considering temperature when evaluating IOL optical characteristics. In this paper, we present a quantitative study on evaluating the impact of environmental temperature changes on IOL fundamental optical properties by testing IOL samples with different materials (e.g., hydrophobic and hydrophilic) and designs (e.g., monofocal and toric) to better encompass types of IOLs in conventional use today. The results from this study demonstrate that significant changes are observed as temperatures are changed from room temperature (20°C) to slightly above body temperature (40°C). Findings indicate that evaluating optical properties at arbitrary temperatures could significantly affect the characterization of IOLs that are already near the tolerance thresholds.

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Spherical Power (SP) [D]	Tolerance [D]	Cylinder Power (CP) [D]	Tolerance on SEP $< 25 D$ [D]	Tolerance on $24 D \leq SEP \leq 34 D$ [D]
$0 \to 15 DP$	$\pm 0.3$	$0 < CP \leq 2.5$	$\pm 0.3$	$\pm 0.4$
$15 \to 25 DP$	$\pm 0.4$	$2.5 < CP \leq 4.5$	$\pm 0.4$	$\pm 0.4$
$25 \to 30 DP$	$\pm 0.5$	$4.5 < CP$	$\pm 0.5$	$\pm 0.5$
$30 \to 34 DP$	$\pm 1.0$

		Spherical Power (SP)			Cylinder Power (CP)
IOL #	Type	Labeled Spherical Power (SP) or SEP [D]	Slope ( $S_{SP}$ )	$Δ T_{SP}$ [%]	Labeled Cylinder Power (CP) [D]	Cylinder Slope ( $S_{P}$ )	$Δ T_{P}$ [%]	Average Astigmatism [D]
1	Monofocal, Material A	36.0	$- 0.018$	34	–	–	–	0.139 ( $\pm 0.006$ ) SP
2	Monofocal, Material A	20.75	$- 0.017$	73	–	–	–	0.052 ( $\pm 0.030$ ) SP
3	Monofocal, Material A	5.0	$- 0.009$	66	–	–	–	0.081 ( $\pm 0.011$ ) SP
4	Toric, Material B	30.0	$- 0.012$	24	2.75	$- 0.0006$	0.5	–
5	Toric, Material B	20.0	$- 0.013$	51	1.25	$- 0.0021$	12	–
6	Toric, Material B	6.0	$- 0.007$	44	2.75	$- 0.0062$	20	–
7	Hydrophobic, Material C	26.0	N/A	$< 1$	–	–	–	0.184 ( $\pm 0.039$ ) SP
8	Hydrophobic, Material C	18.0	N/A	9	–	–	–	0.074 ( $\pm 0.006$ ) SP

Spherical Power (SP) [D]	Tolerance [D]	Cylinder Power (CP) [D]	Tolerance on SEP $< 25 D$ [D]	Tolerance on $24 D \leq SEP \leq 34 D$ [D]
$0 \to 15 DP$	$\pm 0.3$	$0 < CP \leq 2.5$	$\pm 0.3$	$\pm 0.4$
$15 \to 25 DP$	$\pm 0.4$	$2.5 < CP \leq 4.5$	$\pm 0.4$	$\pm 0.4$
$25 \to 30 DP$	$\pm 0.5$	$4.5 < CP$	$\pm 0.5$	$\pm 0.5$
$30 \to 34 DP$	$\pm 1.0$

		Spherical Power (SP)			Cylinder Power (CP)
IOL #	Type	Labeled Spherical Power (SP) or SEP [D]	Slope ( $S_{SP}$ )	$Δ T_{SP}$ [%]	Labeled Cylinder Power (CP) [D]	Cylinder Slope ( $S_{P}$ )	$Δ T_{P}$ [%]	Average Astigmatism [D]
1	Monofocal, Material A	36.0	$- 0.018$	34	–	–	–	0.139 ( $\pm 0.006$ ) SP
2	Monofocal, Material A	20.75	$- 0.017$	73	–	–	–	0.052 ( $\pm 0.030$ ) SP
3	Monofocal, Material A	5.0	$- 0.009$	66	–	–	–	0.081 ( $\pm 0.011$ ) SP
4	Toric, Material B	30.0	$- 0.012$	24	2.75	$- 0.0006$	0.5	–
5	Toric, Material B	20.0	$- 0.013$	51	1.25	$- 0.0021$	12	–
6	Toric, Material B	6.0	$- 0.007$	44	2.75	$- 0.0062$	20	–
7	Hydrophobic, Material C	26.0	N/A	$< 1$	–	–	–	0.184 ( $\pm 0.039$ ) SP
8	Hydrophobic, Material C	18.0	N/A	9	–	–	–	0.074 ( $\pm 0.006$ ) SP

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Applied Optics