PMID- 34590491 OWN - NLM STAT- MEDLINE DCOM- 20220812 LR - 20220812 IS - 1724-6016 (Electronic) IS - 1120-6721 (Linking) VI - 32 IP - 5 DP - 2022 Sep TI - Study of inner retinal neurodegeneration in Diabetes Mellitus using spectral domain optical coherence tomography. PG - 3074-3081 LID - 10.1177/11206721211048793 [doi] AB - PURPOSE: To study inner retinal neurodegeneration in Diabetes Mellitus using spectral domain optical coherence tomography (OCT). METHODS: This cross-sectional study included 40 eyes of age matched healthy subjects (group N), 40 eyes of diabetic patients without diabetic retinopathy (group D) and 160 eyes with diabetic retinopathy (group R) having 40 each in subgroups R1 (mild), R2 (moderate), R3 (severe/very severe) non-proliferative stages and R4 (proliferative stage). Spectral domain OCT was used to measure the ganglion cell-inner plexiform layer (GC-IPL) thickness and retinal nerve fibre layer (RNFL) thickness. RESULTS: The average GC-IPL thickness was significantly lower, both in groups D (p = 0.005) and R (p = 0.009), when compared with group N. The minimum GC-IPL thickness was also significantly lower in groups D (p < 0.001) and R (p < 0.001). There was no statistically significant difference in the average RNFL thickness among the groups. The minimum RNFL thickness was significantly lesser in group D (p = 0.027). The minimum RNFL thickness had a strongly negative correlation with the severity of DR (R = -0.828; p = 0.042). The thinning of both GC-IPL and RNFL was most pronounced in subgroup R4. CONCLUSION: There is a significant reduction in the GC-IPL thickness and the RNFL thickness in diabetes even before the onset of DR. The changes in both GC-IPL thickness and RNFL thickness are most pronounced after the onset of PDR. There is a strongly negative correlation between the minimum RNFL thickness with the severity of DR. FAU - Ambiya, Vikas AU - Ambiya V AUID- ORCID: 0000-0001-9439-2268 AD - Command Hospital, Kolkata, India. FAU - Kumar, Ashok AU - Kumar A AUID- ORCID: 0000-0003-0853-3744 AD - Armed Forces Medical College, Pune, India. FAU - Bhavaraj, Veerabhadra Rao AU - Bhavaraj VR AD - Command Hospital, Kolkata, India. FAU - Sharma, Vijay AU - Sharma V AD - Command Hospital, Kolkata, India. FAU - Sharma, Neeraj AU - Sharma N AD - Command Hospital, Kolkata, India. LA - eng PT - Journal Article DEP - 20210930 PL - United States TA - Eur J Ophthalmol JT - European journal of ophthalmology JID - 9110772 SB - IM MH - Cross-Sectional Studies MH - *Diabetes Mellitus MH - *Diabetic Retinopathy/diagnosis MH - Humans MH - Nerve Fibers MH - Retinal Ganglion Cells MH - Tomography, Optical Coherence/methods OTO - NOTNLM OT - Diabetes Mellitus OT - GC-IPL OT - RNFL OT - diabetic retinopathy EDAT- 2021/10/01 06:00 MHDA- 2022/08/13 06:00 CRDT- 2021/09/30 08:38 PHST- 2021/10/01 06:00 [pubmed] PHST- 2022/08/13 06:00 [medline] PHST- 2021/09/30 08:38 [entrez] AID - 10.1177/11206721211048793 [doi] PST - ppublish SO - Eur J Ophthalmol. 2022 Sep;32(5):3074-3081. doi: 10.1177/11206721211048793. Epub 2021 Sep 30.