The thickness of the retina, choroid and sclera in different posterior sclera shape in high myopia

Objective To observe the thickness of the retina, retinal nerve fiber layer (RNFL), choroid and sclera among the difference posterior sclera shape (PSS) in high myopia (HM). Methods Sixty HM patients (96 eyes) were enrolled in this study. There were 18 males (25 eyes) and 42 females (71 eyes). The mean age was (51.32±10.06) years. The mean spherical equivalent was(-14.38±6.31) DS. The mean axial length was (29.49±2.44) mm. The eyes were evaluated from deep range imaging optical coherent tomography (DRI-OCT) Atlantis 3D model, and divided as four groups include PSS-Ⅰ (27 eyes), PSS-Ⅱ (46 eyes), PSS-Ⅲ (11 eyes) and PSS-Ⅸ (12 eyes) according to the Curtin classification method. The thickness of the retina, RNFL, choroid and sclera were measured in the EDTRS Grid area. Results There were statistically significant differences in the thickness of retina of the central, first circle, second circle in the EDTRS Grid area among PSS-Ⅰ, PSS-Ⅱ, PSS-Ⅲ and PSS-Ⅸ groups (F=4.48, 5.03, 4.98; P>0.01). There was no statistically significant differences in the thickness of RNFL among four groups (F=0.13, P=0.93). There was no statistically significant differences in the central choroidal thickness (F=0.31, P=0.81). There were statistically significant differences in the first circle, second circle choroidal thickness among four groups (F=2.86, 2.96; P=0.04, 0.04). There was no statistically significant differences in the thickness of sclera under macular fovea among four groups (F=0.80, P=0.49). Conlusions There are changes of thickness of the retina, choroid present in the difference EDTRS Grid area among the difference PSS in HM, and changes in PSS-Ⅸ is most obvious. Key words: Myopia, degenerative/complications; Scleral diseases; Tomography, optical coherence; Retinal thickness; Choroidal thickness