Abstract: Examination of retinal nerve fiber layer (RNFL) and ganglion cell complex (GCC) have been widely used for the screening and diagnosis of early glaucoma, but the thicknesses of RNFL and GCC are affected by race, age, sex, ocular factors and systemic diseases. Optic disc size is one of the important influencing factors for measuring the thickness of RNFL and GCC in patients with different optic disc sizes using optical coherence tomography (OCT). The measurement of RNFL in the normal scanning mode of OCT is influenced by the size of optic disc, and the RNFL in large optic disc is thicker. Therefore, proportional scanning mode is more suitable for RNFL measurement of different types of optic disc. However, it is still controversial whether patients with larger optic disc have greater GCC thickness measurements than those with small optic disc, which needs further study to verify. (Int Rev Ophthalmol, 2023, 47: 308-314)

Key words: glaucoma, optic disc, retinal nerve fiber layer