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Indian J Ophthalmol. 2020 Jan;68(1):66-70. doi: 10.4103/ijo.IJO_285_19.

The effects of vıtal dyes on mechanıcal propertıes of the human anterıor lens capsule.

Author information

1
Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan; Department of Ophthalmology, Sitki Kocman University, Mugla, Turkey.
2
Department of Ophthalmology, Health Sciences University Van Education and Training Hospital, Van, Turkey.

Abstract

Purpose:

The purpose of this study was to evaluate the mechanical effects of vital dyes on the anterior lens capsule via the nanoindentation method.

Methods:

Twenty anterior lens capsules of 20 different patients were dissected into four equal fragments. Each fragment was stained separately with dyes for intraocular surgeries, such as trypan blue 0.06% (TB), brilliant blue 0.025% (BB), and indocyanine green 0.05% (ICG), for 1 min. The remaining fragment was assessed as an untreated control group. The alterations on the mechanical characteristics of the anterior lens capsule were evaluated using a nanoindentation testing device with Oliver-Pharr and Martens hardness methods.

Results:

The mean values of elasticity were 7.842 ± 0.55 GPa for capsules fragments stained with TB (P < 0.05), 8.407 ± 0.82 GPa for capsules fragments stained with BB (P < 0.05), 8.557 ± 0.60 GPa for ICG (P < 0.05), and 6.09 ± 0.57 GPa for the untreated control group. The mean values of stiffness were 299.7 ± 47 MPa for TB (P < 0.05), 317.9 ± 34 MPa for BB (P < 0.05), 331.8 ± 48 MPa for ICG (P < 0.05), and 229.85 ± 44 MPa for the untreated control group. The elasticity of the capsules statistically decreased in comparison to the control group, and the capsule stiffness showed a statistically significant increase in comparison to the untreated controls.

Conclusion:

The mechanical characteristics of the human anterior lens capsule were affected in association with the alterations in the elasticity and stiffness properties of the capsule as a result of exposure to three different dyes.

KEYWORDS:

Elasticity; hardness; lens capsule; nanoindentation; vital dyes

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