|Year : 2021 | Volume
| Issue : 3 | Page : 455
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|
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
Source of Support: None, Conflict of Interest: None
|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, leading to the birefringence which is an optical property of the material. This depends upon both light polarization and propagation, 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|| |
Alonso J, Gómez-Pedrero JA, Quiroga JA. Lens Manufacturing and Measurement in Modern Ophthalmic Optics. Cambridge UniversityPress; 2019. p. 355-404.
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.