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OPHTHALMIC IMAGE
Year : 2021  |  Volume : 1  |  Issue : 3  |  Page : 455

Birefringence in ophthalmic lenses


1 Consultant Optometrist, L V Prasad Eye Institute, Hyderabad, Telangana, India
2 L V Prasad Eye Institute, Hyderabad, Telangana, India

Date of Web Publication02-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
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijo.IJO_2709_20

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How to cite this article:
Manchikanti N, Maseedupalli S. Birefringence in ophthalmic lenses. Indian J Ophthalmol Case Rep 2021;1:455

How to cite this URL:
Manchikanti N, Maseedupalli S. Birefringence in ophthalmic lenses. Indian J Ophthalmol Case Rep [serial online] 2021 [cited 2021 Jul 28];1:455. Available from: https://www.ijoreports.in/text.asp?2021/1/3/455/320006



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 Top

1.
Alonso J, Gómez-Pedrero JA, Quiroga JA. Lens Manufacturing and Measurement in Modern Ophthalmic Optics. Cambridge UniversityPress; 2019. p. 355-404.  Back to cited text no. 1
    
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.  Back to cited text no. 2
    


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  [Figure 1]



 

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