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| OPHTHALMIC IMAGE |
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| Year : 2021 | Volume
: 1
| Issue : 3 | Page : 455 |
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Birefringence in ophthalmic lenses
Neelima Manchikanti1, Srikanth Maseedupalli2
1 Consultant Optometrist, L V Prasad Eye Institute, Hyderabad, Telangana, India
2 L V Prasad Eye Institute, Hyderabad, Telangana, India
| Date of Web Publication | 02-Jul-2021 |
Correspondence Address:
Srikanth Maseedupalli
Optometrist, Brien Holden Institute of Optometry and Vision Sciences, L V Prasad Eye Institute, Gullapalli Pratibha Rao Campus, Don Bosco Nagar PO, Hyderabad - 500 086, Telangana
India
 Source of Support: None, Conflict of Interest: None
DOI: 10.4103/ijo.IJO_2709_20
How to cite this article:
Manchikanti N, Maseedupalli S. Birefringence in ophthalmic lenses. Indian J Ophthalmol Case Rep 2021;1:455 |
This picture is a rare sight of the birefringence in a surfaced polycarbonate lens. Stress in the lens shifts the isotropic material to anisotropic,[1] leading to the birefringence which is an optical property of the material. This depends upon both light polarization and propagation,[2] seen in anisotropic materials such as tightly fitted and insufficiently-cooled ophthalmic lenses (injection molding). It is visualized through a polariscope, appears as a field of colorful-fringes [Figure 1]. Polycarbonate lenses are made by injection molding have low optical quality and can cause difficulty in adaptation to the wearer. Therefore, it is vital to check stress marks before dispensing. | Figure 1: Showing the colorful birefringence pattern and stress marks in an ophthalmic lens under the polariscop
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Financial support and sponsorship
Hyderabad Eye Research Foundation.
Conflicts of interest
There are no conflicts of interest.
| References | |  |
| 1. | Alonso J, Gómez-Pedrero JA, Quiroga JA. Lens Manufacturing and Measurement in Modern Ophthalmic Optics. Cambridge UniversityPress; 2019. p. 355-404.  |
| 2. | Alonso J, Gómez-Pedrero JA, Quiroga JA. Ophthalmic materials in Modern Ophthalmic Optics. Cambridge UniversityPress: University Printing House, Cambridge CB2 8BS, United Kingdom 2019. p. 1-20. |
[Figure 1]
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