A STUDY TO ASSESS THE CONTRAST SENSITIVITY OF THE HUMAN VISUAL SYSTEM IN PATIENTS WITH OR WITHOUT DIABETES IN A TERTIARY CARE HOSPITAL

  • NIKITA RAJGADIA Department of Ophthalmology, Saveetha Medical College, Chennai, Tamil Nadu
  • BINDU BHASKARAN Department of Ophthalmology, Saveetha Medical College, Chennai, Tamil Nadu
  • N. DIVYA Department of Ophthalmology, Saveetha Medical College, Chennai, Tamil Nadu
  • V. PANIMALAR A. VEERAMANI Department of Ophthalmology, Saveetha Medical College, Chennai, Tamil Nadu
  • SYEDA SADIYA IKRAM Department of Ophthalmology, Saveetha Medical College, Chennai, Tamil Nadu

Abstract

Objective: The objective of our study was to assess the variations in contrast sensitivity values of normoglycemic subjects and that of type II diabetic subjects of the same age group. It was also aimed at finding the visual acuities and study the associations of it with contrast sensitivity if any.


Methods: It was a hospital-based comparative cross-sectional descriptive study conducted in the out-patient department of the Department of Ophthalmology, Saveetha Medical College, Hospital, Chennai. Visual Acuity and Contrast Sensitivity of 50 Type II Diabetic individuals and 50 age-equivalent control group subjects were measured using the Snellen’s chart and Pelli-Robson chart, respectively, during the months of January to March 2020.


Results: Contrast Sensitivity measurements from 50 subjects with Non-Insulin dependent Diabetes Mellitus (NIDDM) were obtained. The subjects were the ones who had minimal or no diabetic retinopathy. It was observed that there is a significant association between reduced contrast sensitivity and Diabetes (P value<.00008). We also noted that CS may be reduced without corresponding loss of Visual Acuity. Hence, both visual acuity and contrast sensitivity measurements are helpful in the assessment of visual impairment due to diabetic eye disease.


Conclusion: The contrast sensitivity can be seen as an early marker for visual impairment in diabetic eye care.

Keywords: Visual acuity, Pelli-Robson Chart, Diabetic Eye diseases

References

1. World Health Organization. Global report on diabetes: executive summary (No. WHO/NMH/NVI/16.3). World Health Organization; 2016.
2. Klein BE. Overview of epidemiologic studies of diabetic retinopathy. Ophthalmic Epidemiol 2007;14:179–83.
3. Noticewala V, Shastri M. A study of contrast sensitivity changes in normal individual and diabetic patients with and without diabetic retinopathy. Int J Res Med Sci 2017;5:4840-5.
4. ”Overview” Indian Heart Association; 2020.
5. Aoa.org. Available from: https://www.aoa.org/Documents/ optometric-staff/Articles/Contrast-Sensitivity.pdf [Last accessed on 18 Aug 2020]
6. Slideshare.net. Contrast Sensitivity; 2020. Available from: https://www.slideshare.net/laxmieyeinstitute/contrast-sensitivity [Last accessed on 18 Aug 2020]
7. Mellitus D. Diagnosis and classification of diabetes mellitus. Diabetes Care 2005;28:S5-S10.
8. Parede Tais, Torricelli Andre, Mukai Adriana, Netto Marcelo, Bechara Samir. Quality of vision in refractive and cataract surgery, indirect measurers: review article. Arquivos brasileiros de oftalmologia. 2013;76:386-90.
9. Davidson JA, Ciulla TA, McGill JB, Kles KA, Anderson PW. How the diabetic eye loses vision. Endocrine 2007;32:107-16.
10. Sciencedirect.com. Contrast sensitivity-an overview | Sciencedirect topics. Available from: https://www.sciencedirect.com/topics/medicine-and-dentistry/contrast-sensitivity#:~:text=Visual%20contrast%20sensitivity%20is%20a,41.1). [Last accessed on 18 Aug 2020]
11. National Research Council (US) Committee on Disability Determination for Individuals with Visual Impairments; Lennie P, Van Hemel SB. editors. Visual Impairments: Determining Eligibility for Social Security Benefits. Washington (DC): National Academies Press (US); 2002. 2, TESTS OF VISUAL FUNCTIONS. Available from: https://www.ncbi.nlm.nih.gov/
12. books/NBK207559/ [Last accessed on 18 Aug 2020]
13. Wender M. Value of pelli-robson contrast sensitivity chart for evaluation of visual system in multiple sclerosis patients. Neurologia I Neurochirurgia Polska 2006;41:141.
14. Sieiro RDO, Coelho LM, Boas PCV, Fonseca SC, Souza SR, Guimaraes TDP. Avaliacao da funcao de sensibilidade ao contraste em diferentes faixas etarias nas medias e altas frequencias espaciais. Revista Brasileira de Oftalmologia 2016;75:296-9.
15. Darius S, Bergmann L, Blaschke S, Bockelmann I. Influence of sex and age on contrast sensitivity subject to the applied method. Klinische Monatsblatter Fur Augenheilkunde 2018;235:212-8.
16. Mangouritsas G, Katoulis E, Kepaptsoglou O, Zoupas C. Effekt von provozierter Hyperglykamie auf die Kontrastempfindlichkeitsfunktion bei insulinpflichtigen Diabetikern [Effect of induced hyperglycemia on contrast sensitivity function in insulin-dependent diabetic patients]. Ophthalmologe 1995;92:142-7.
17. Sokol S, Moskowitz A, Skarf B, Evans R, Molitch M, Senior B. Contrast sensitivity in diabetics with and without background retinopathy. Arch Ophthalmol 1985;103:51–4.
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RAJGADIA, N., B. BHASKARAN, N. DIVYA, V. P. A. VEERAMANI, and S. S. IKRAM. “A STUDY TO ASSESS THE CONTRAST SENSITIVITY OF THE HUMAN VISUAL SYSTEM IN PATIENTS WITH OR WITHOUT DIABETES IN A TERTIARY CARE HOSPITAL”. International Journal of Current Pharmaceutical Research, Vol. 12, no. 6, Nov. 2020, pp. 24-26, doi:10.22159/ijcpr.2020v12i6.40274.
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