Effect of axis orientation and amount of astigmatism on visual acuity.

Authors

  • Sadia Parveen COAVS, KEMU

Abstract

AIMS: The purpose of the study was to find out the effect of axis orientation and amount of astigmatism on visual acuity.

METHODOLOGY: An informed consent was taken describing the detail of the study and implication; therefore, the subjects were assured of their confidentiality of information and outcome. The sample size was 70 patients. Patients’ visual acuity was taken. After that objective refraction was done with retinoscopy technique. At the end, subjective refraction of patients was done. And the effect of axis orientation of astigmatism (with-the-rule, against-the-rule, or oblique astigmatism) on patient visual acuity was measured.

RESULTS: Most of the patients had with the rule astigmatism; they had good visual acuity as compared to against the rule and oblique astigmatism. The amount of against the rule astigmatism was moderate and visual acuity ranges in 22 patients out of 70 was 6/24-6/60. The amount of astigmatism in with the rule astigmatism was mild and visual acuity ranges in 24 patients out of 70 was 6/9-6/12. The amount of oblique astigmatism was severe and visual acuity ranges in 21 patients out of 70 was 6/18-6/24.

CONCLUSION: Against the rule, astigmatism affects the visual acuity more as compared to with the rule and oblique astigmatism.

Downloads

Additional Files

Published

2016-10-01

Issue

Vol. 6 No. 04 (2016): October

Section

Original Article

License

OWNERSHIP OF COPYRIGHT

The copyright in this website and the material on this website (including without limitation the text, computer code, artwork, photographs, images, music, audio material, video material and audio-visual material on this website) is owned by OPHTHALMOLOGY PAKISTAN.

 

COPYRIGHT LICENSE

OPHTHALMOLOGY PAKISTAN grants to you a worldwide non-exclusive royalty-free revocable license to:

a) view this website and the material on this website on a computer or mobile device via a web browser;

b) copy and store this website and the material on this website in your web browser cache memory; and

c) print pages from this website for your use.

d) OPHTHALMOLOGY PAKISTAN permits all published articles to be copied, redistributed, remixed, transmitted and the work be adapted provided the original work and source is appropriately cited.

OPHTHALMOLOGY PAKISTAN does not grant any other rights in relation to this website or the material on this website. In other words, all other rights are reserved.

For the avoidance of doubt, you must not adapt, edit, change, transform, publish, republish, distribute, redistribute, broadcast, rebroadcast or show or play in public this website or the material on this website (in any form or media) without appropriately and conspicuously citing the original work and source or OPHTHALMOLOGY PAKISTAN prior written permission.

 

PERMISSIONS

You may request permission to use the copyright materials on this website by writing to chiefeditor@ophthalmologypakistan.com.

 

ENFORCEMENT OF COPYRIGHT

OPHTHALMOLOGY PAKISTAN takes the protection of its copyright very seriously.

If OPHTHALMOLOGY PAKISTAN discovers that you have used its copyright materials in contravention of the license above, OPHTHALMOLOGY PAKISTAN may bring legal proceedings against you seeking monetary damages and an injunction to stop you using those materials. You could also be ordered to pay legal costs.

If you become aware of any use of OPHTHALMOLOGY PAKISTAN' copyright materials that contravenes or may contravene the license above, please report this by email to chiefeditor@ophthalmologypakistan.com.

Infringing material

If you become aware of any material on the website that you believe infringes your or any other person's copyright, please report this by email to chiefeditor@ophthalmologypakistan.com.