Correlation between macular sensitivity and kidney function in patients with diabetes.

Purpose: The aim of this study is to investigate the correlation between kidney function in patients with diabetes and macular sensitivity at central 10° using microperimetry.

Methods: A cross-sectional study was carried out on 30 diabetic patients (58 eyes). A full-threshold microperimetry of the central 10° of retina (the macula) was performed on all subjects, consisting of 37 measurement points, using a 4-2 representation strategy. Macular sensitivity was expressed as the average threshold value in decibels for the entire field tested. The correlation between macular sensitivity and GFR, as well as microalbuminuria, blood glucose and HbA1c, was calculated using Pearson correlation rank.

Results: A significant positive correlation was observed between GFR and macular sensitivity among both male and female study subjects. For male participants, the correlation was measured to r([16]) = [.615], p = [<.007] and r([15]) = [.844], p = [<.001] for the left and right eyes, respectively. As for female participants, the correlation was r ([9]) = [.903], p = [<.001] and r([10]) = [.941], p = [<.001] for the left and right eyes, respectively. The correlation between macular sensitivity and the following variables was statistically insignificant: microalbuminuria, blood glucose, and HbA1c.

Conclusion: Despite intact visual acuity measured on standard ophthalmic examination, patients with impaired kidney function had decreased macular sensitivity. This emphasizes the importance of microperimetry in preventative care and detection of early signs of diabetic retinopathy. Furthermore, we should consider the use of microperimetry as an auxiliary tool for monitoring kidney function in diabetics.