Details

Autor(en) / Beteiligte

• Tan, Qing-Qing
• Wen, Bai-Wei
• Liao, Xuan
• Tian, Jing
• Lin, Jia
• Lan, Chang-Jun

Titel

Optical quality in low astigmatic eyes with or without cylindrical correction

Ist Teil von

• Graefe's archive for clinical and experimental ophthalmology, 2020-02, Vol.258 (2), p.451-458

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2020

Quelle

SpringerLink

Beschreibungen/Notizen

• Purpose To investigate whether optical quality could be improved by cylindrical correction for low astigmatic eyes with different amounts and axis orientations in patients with myopia up to − 3.00 diopters (D). Methods A cross-sectional study enrolling healthy young eyes with 0 to − 3.00 D myopia and − 0.50 to − 0.75 D myopic astigmatism was implemented. With a repeated-measures design, outcome measures were sequentially obtained for each subject under two correction modalities: spherocylindrical correction and spherical correction. Subjective refraction was used to determine the refractive prescriptions accordingly in the two correction modalities to obtain optimal subject-reported visual acuity. Primary outcomes were optical quality parameters including objective scatter index (OSI), modulation transfer function (MTF) cut-off, Strehl ratio (SR), and a simulated contrast visual acuity-optical quality analysis system (OQAS) values (OV) obtained by a double-pass system. Corrected distance visual acuity (CDVA) was measured as a secondary outcome. Outcome comparisons between the two correction modalities were performed by grouping in different amounts (− 0.50 D, − 0.75 D) and axes (with the rule, WTR; against the rule, ATR; oblique, OBL) of astigmatism. Results A total of 194 eyes of 194 subjects were evaluated. Significantly better CDVA were shown by spherocylindrical correction for all types of astigmatism except for − 0.50 D WTR astigmatism ( P = 0.831). For eyes with − 0.50 D WTR astigmatism, better outcome was only shown in OSI with spherocylindrical correction ( P = 0.019). For eyes with − 0.50 D ATR and OBL astigmatism, spherocylindrical correction demonstrated better outcomes in all parameters except for SR ( P > 0.05). For eyes with − 0.75 D astigmatism, significantly better outcomes in all optical quality parameters were shown with spherocylindrical correction regardless of the axis ( P < 0.05). Conclusions Eyes with ATR or OBL myopic astigmatism may benefit in optical quality and visual acuity by combining a cylindrical correction even with a low amount down to − 0.50 D. However, optical quality and visual acuity improvement are limited for WTR astigmatic eyes when the amount of astigmatism is less than − 0.75 D.