Allinjawi Kareem, Kaur Sharanjeet, Akhir Saadah M, Mutalib Haliza A
Optometry and Vision Science Programme, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, Malaysia.
Department of Optometry, University of Jeddah, Hamzah Ibn Al Qasim Street, Al Sharafeyah, Jeddah, Saudi Arabia.
Saudi J Ophthalmol. 2020 Dec 28;34(2):94-100. doi: 10.4103/1319-4534.305035. eCollection 2020 Apr-Jun.
The purpose was to determine the minimum near-addition power needed using Proclear multifocal D-Design contact lens (adds: +1.50 D, +2.50 D, +3.00 D, and +3.50 D) to invert the pattern of relative hyperopic defocus in the peripheral retina into relative myopic defocus among the eyes of myopic schoolchildren.
Twenty-seven right eyes (24 females and 3 males) of 27 myopic schoolchildren aged between 13 and 15 years were included in this study. The measurements of central refraction, peripheral refraction (between 35° temporal and 35° nasal visual field in 5° steps), and lag of accommodation were conducted using the Grand-Seiko WR-5100K open-field autorefractometer initially without correction (WC), followed by with correction using four different addition powers of Proclear multifocal D-Design contact lens in random sequence. Axial length was measured using a handheld probe ultrasound A-scan (Tomey AL-2000).
The relative peripheral refractive error showed high hyperopic defocus of +1.08 ± 1.24 D at 35° nasal and +1.06 ± 1.06 D at 35° temporal visual field WC. All Proclear multifocal contact lenses (MFCLs) decreased the peripheral hyperopic defocus with increasing addition powers (F [2.938, 47.001] = 13.317, < 0.001). However, only +3.00 D addition and +3.50 D addition ( = 0.001) could invert the peripheral hyperopic defocus into peripheral myopic defocus. Apart from that, the +3.00 D addition lens showed the lowest lag of accommodation (+1.10 ± 0.83 D) among the other MFCL adds ( = 0.002).
A +3.00 D addition Proclear MFCL is the optimal addition power that can invert the pattern of peripheral hyperopic defocus into myopic defocus.
本研究旨在确定使用博士伦多焦点D设计隐形眼镜（附加度数：+1.50D、+2.50D、+3.00D和+3.50D）将近视学龄儿童眼中周边视网膜相对远视性离焦模式转变为相对近视性离焦所需的最小近附加度数。
本研究纳入了27名年龄在13至15岁之间的近视学龄儿童的27只右眼（24名女性和3名男性）。最初在未矫正（WC）的情况下，使用Grand-Seiko WR-5100K开放式自动验光仪测量中央屈光、周边屈光（在颞侧35°和鼻侧35°视野范围内，以5°步长）和调节滞后，随后以随机顺序使用博士伦多焦点D设计隐形眼镜的四种不同附加度数进行矫正后测量。使用手持探头超声A扫描（Tomey AL-2000）测量眼轴长度。
在未矫正时，周边相对屈光不正显示在鼻侧35°视野处有+1.08±1.24D的高度远视性离焦，在颞侧35°视野处有+1.06±1.06D的高度远视性离焦。所有博士伦多焦点隐形眼镜（MFCL）随着附加度数增加而减少周边远视性离焦（F[2.938, 47.001]=13.317，P<0.001）。然而，只有+3.00D附加度数和+3.50D附加度数（P=0.001）能将周边远视性离焦转变为周边近视性离焦。除此之外，+3.00D附加度数镜片在其他MFCL附加度数中显示出最低的调节滞后（+1.10±0.83D）（P=0.002）。
+3.00D附加度数的博士伦MFCL是能够将周边远视性离焦模式转变为近视性离焦的最佳附加度数。
