Prevalence and Pattern of Corneal Morbidity Based on a New Nomogram and Graticule
Purpose: To study the pattern of corneal diseases using a new nomogram and graticule. Materials and Methods: 256 eyes of 200 patients attending the cornea services of the institute from July 2011 to June 2012 were included in the study. The visual status of the patients was assessed using the WHO de...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wolters Kluwer Medknow Publications
2014-01-01
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| Series: | Delhi Journal of Ophthalmology |
| Subjects: | |
| Online Access: | https://journals.lww.com/10.7869/djo.35 |
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| Summary: | Purpose:
To study the pattern of corneal diseases using a new nomogram and graticule.
Materials and Methods:
256 eyes of 200 patients attending the cornea services of the institute from July 2011 to June 2012 were included in the study. The visual status of the patients was assessed using the WHO definition for visual impairment. Patient evaluation was done using Haag-Striet photo slit lamp and images were recorded. A new nomogram was created for topographical mapping of corneal lesions by dividing the cornea into four concentric zones i.e. central optical (4mm), paracentral (4-8mm), peripheral (8-11mm) and limbal (11-12mm) taking the optical centre of the cornea (O) as the reference. Each zone was further divided into four quadrants (UN, UT, LN and LT) by a horizontal and vertical axis passing through O. Visual axis (VA) passed through V, represented 5°nasal to O. The graticule (magnification 6X) was superimposed on the photograph for mapping the lesions.
Results:
The most common disease entities affecting the cornea were infective causes (27%), corneal opacities (25%) and PBK (13%). Central zone (Z I) was involved most frequently and VA involvement was seen in (79%) cases. The corneal lesions were described as per the methodology and correlated well with the visual morbidity pattern.
Conclusions:
This new nomogram may provide a precise methodology for mapping of corneal lesions along with the assessment of visual morbidity and VA involvement. |
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| ISSN: | 0972-0200 2454-2784 |