Influence of the Diameter and Decentration of the Treatment Zone on Optical Quality and Visual Performance after Orthokeratology
Sisi Lin,Zhenguo Chen,Jianyong Wang,Haimin Li,Fan Lu
Department of Ophthalmology, Ruian People's Hospital, the 3rd Affiliated Hospital of Wenzhou Medical University, Wenzhou 325200, China
Wenzhou Medical University, Wenzhou 325035, China
Objective: To analyze the changes in corneal higher order aberrations (HOAs) and contrast sensitivity (CS) after orthokeratology (ortho-K) treatment, and their correlation with the magnitude of lens decentration.Methods: This was a prospective study. Thirty-one patients (31 eyes) who had undergone orthokeratology treatment from March to August 2017 in 3rd Affiliated Hospital of Wenzhou Medical University were chosen for the study. Corneal topography, CS and corneal HOAs were measured before and one month after ortho-K lens treatment, in addition, the diameter and decentration of the treatment zone and their inf luence on corneal HOAs and CS were analyzed. CS was expressed as area under log contrast sensitivity function(AULCSF) was a paired-t test, pearson correlation and stepwise multiple linear regression were used to analyze the data. results: The mean TxZ diameter was 3.48±0.49 mm, while the mean decentration of TxZ was 0.64±0.27 mm, mostly toward the inferior temporal quadrant (45%). The root mean squares (RMS) of the total corneal HOAs, corneal spherical aberrations corneal vertical coma aberrations and corneal horizontal coma aberrations increased after one month of treatment (t=10.99, 10.19, -2.21, -3.50,P<0.05). The vertical decentration of TxZ was significantly correlated with the corneal vertical coma aberrations (standard B=0.620, P=0.001), while the horizontal decentration was significantly correlated with the corneal horizontal coma aberrations (standard B=0.422, P=0.049). The photopic and mesopic AULCSF tended to decrease, but there were no significant differences. The change in photopic AULCSF only correlated with the change in diopters (standard B=0.452, P=0.021), while the change in mesopic AULCSF correlated with both the change in diopters (standard B=0.528, P=0.004) and the decentration of TxZ (standard B=0.458, P=0.027). conclusions: Decentered othokeratology lenses increase corneal HOAs but do not affect CS.
林思思,陈镇国,王建勇,李海敏,吕帆. 角膜塑形术后光学治疗区大小及偏心对光学及视觉质量的影响[J]. 中华眼视光学与视觉科学杂志, 2018, 20(9): 530-535.
Sisi Lin,Zhenguo Chen,Jianyong Wang,Haimin Li,Fan Lu . Influence of the Diameter and Decentration of the Treatment Zone on Optical Quality and Visual Performance after Orthokeratology. Chinese Journal of Optometry Ophthalmology and Visual science, 2018, 20(9): 530-535. DOI: 10.3760/cma.j.issn.1674-845X.2018.09.004
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