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Retinal sensitivity in healthy Indians using microperimeter.
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Males had significantly increased retinal sensitivity (18.34 vs. 18.17 dB, P = 0.03).Contrast sensitivity was significantly correlated with the mean retinal sensitivity (r = 0.432, P < 0.001).These normative values could help in drawing a meaningful conclusion in various retinal pathologies.
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PubMed Central - PubMed
Affiliation: Shri Bhagwan Mahavir Vitreoretinal Services, Sankara Nethralaya, Chennai, Tamil Nadu, India.
ABSTRACT
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Aims: To establish the retinal sensitivity values in healthy Indians using microperimeter. Materials and methods: In this prospective study, 144 healthy volunteers were included. All the participants underwent a comprehensive ophthalmic examination including contrast sensitivity. Microperimetry was performed in the central 20° of the macula using 76 stimulus points to assess the retinal sensitivity, and the fixation characteristics in the study population were assessed. Results: The mean age of the study sample was 43.08 ± 10.85 years (range: 25-69). Mean retinal sensitivity was 18.26 ± 0.99 dB. Males had significantly increased retinal sensitivity (18.34 vs. 18.17 dB, P = 0.03). The linear regression analysis revealed a 0.04 dB per year age-related decline in mean retinal sensitivity. Contrast sensitivity was significantly correlated with the mean retinal sensitivity (r = 0.432, P < 0.001). Fixation stability in the central 2° and 4° were 69% and 89%, respectively. Conclusion: Microperimeter is an ideal tool to assess the retinal sensitivity and the fixation behavior. These normative values could help in drawing a meaningful conclusion in various retinal pathologies. Related in: MedlinePlus |
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Figure 3: Showing fixation stability in study population Mentions: The fixation stability values in the central 2° and 4° were 69% and 89%, respectively. No difference in fixation stability found between the genders. Fig 3 shows the fixation characteristics in the study population. There was no correlation found between age and fixation stability. The average time taken for the subjects to perform the test was 16 min 17 sec. The average eye speed of the subjects during the test was 0.32 ± 0.37. |
View Article: PubMed Central - PubMed
Affiliation: Shri Bhagwan Mahavir Vitreoretinal Services, Sankara Nethralaya, Chennai, Tamil Nadu, India.
Aims: To establish the retinal sensitivity values in healthy Indians using microperimeter.
Materials and methods: In this prospective study, 144 healthy volunteers were included. All the participants underwent a comprehensive ophthalmic examination including contrast sensitivity. Microperimetry was performed in the central 20° of the macula using 76 stimulus points to assess the retinal sensitivity, and the fixation characteristics in the study population were assessed.
Results: The mean age of the study sample was 43.08 ± 10.85 years (range: 25-69). Mean retinal sensitivity was 18.26 ± 0.99 dB. Males had significantly increased retinal sensitivity (18.34 vs. 18.17 dB, P = 0.03). The linear regression analysis revealed a 0.04 dB per year age-related decline in mean retinal sensitivity. Contrast sensitivity was significantly correlated with the mean retinal sensitivity (r = 0.432, P < 0.001). Fixation stability in the central 2° and 4° were 69% and 89%, respectively.
Conclusion: Microperimeter is an ideal tool to assess the retinal sensitivity and the fixation behavior. These normative values could help in drawing a meaningful conclusion in various retinal pathologies.
