ISSN 0303-5212
 

Original Research 


Impact of morphologic changes of foveal avascular zone on contrast sensitivity in diabetic patients

Sherif S. Karawya, Neveen M. Sabra.

Abstract
Objective

To assess contrast sensitivity in relation to different Foveal Avascular Zone (FAZ) abnormalities in diabetic patients.

Method

Forty five diabetic patients underwent fluorescein angiography to study morphologic changes, namely FAZ diameter and regularity of perifoveal capillary network using mid phase frames. A grading scheme was used to study both features. Patients were classified into 3 groups according to FAZ morphologic features. Contrast sensitivity testing was done in all patients in four spatial frequencies (3, 6, 12 and 18 cycles/degree [c/deg]). The significance of difference between groups concerning contrast sensitivity values was assessed.

Results

Reduction of contrast sensitivity at 6 c/deg was significantly related to increased FAZ diameter (p=0.01), while reduction at 6 c/deg and 12 c/deg was significantly related to disturbed FAZ outline (p=0.002)

Conclusions

Contrast sensitivity could be a clinical adjunct in diagnosing early ischemic diabetic maculopathy. (Rawal Med J 2009; 34: 51-53).

Key words: Contrast sensitivity, diabetes, foveal avascularzone, ischemic maculopathy.


 
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Pubmed Style

Sherif S. Karawya, Neveen M. Sabra. Impact of morphologic changes of foveal avascular zone on contrast sensitivity in diabetic patients. RMJ. 2009; 34(1): 51-53.


Web Style

Sherif S. Karawya, Neveen M. Sabra. Impact of morphologic changes of foveal avascular zone on contrast sensitivity in diabetic patients. https://www.rmj.org.pk/?mno=7217 [Access: December 07, 2023].


AMA (American Medical Association) Style

Sherif S. Karawya, Neveen M. Sabra. Impact of morphologic changes of foveal avascular zone on contrast sensitivity in diabetic patients. RMJ. 2009; 34(1): 51-53.



Vancouver/ICMJE Style

Sherif S. Karawya, Neveen M. Sabra. Impact of morphologic changes of foveal avascular zone on contrast sensitivity in diabetic patients. RMJ. (2009), [cited December 07, 2023]; 34(1): 51-53.



Harvard Style

Sherif S. Karawya, Neveen M. Sabra (2009) Impact of morphologic changes of foveal avascular zone on contrast sensitivity in diabetic patients. RMJ, 34 (1), 51-53.



Turabian Style

Sherif S. Karawya, Neveen M. Sabra. 2009. Impact of morphologic changes of foveal avascular zone on contrast sensitivity in diabetic patients. Rawal Medical Journal, 34 (1), 51-53.



Chicago Style

Sherif S. Karawya, Neveen M. Sabra. "Impact of morphologic changes of foveal avascular zone on contrast sensitivity in diabetic patients." Rawal Medical Journal 34 (2009), 51-53.



MLA (The Modern Language Association) Style

Sherif S. Karawya, Neveen M. Sabra. "Impact of morphologic changes of foveal avascular zone on contrast sensitivity in diabetic patients." Rawal Medical Journal 34.1 (2009), 51-53. Print.



APA (American Psychological Association) Style

Sherif S. Karawya, Neveen M. Sabra (2009) Impact of morphologic changes of foveal avascular zone on contrast sensitivity in diabetic patients. Rawal Medical Journal, 34 (1), 51-53.