Figure 2: Boxplots showing the mean values of optical coherence tomographic tear meniscus parameters for each group. The values decrease with increasing severity of DMR. Statistical significant exists between DM and control, and NDPR and PDR. TMH: tear meniscus height, TMD: tear meniscus depth, TMA: tear meniscus area, DMR: diabetic retinopathy, NPDR: non-proliferative diabetic retinopathy, PDR: proliferative diabetic retinopathy.