Comparison of accommodation and accommodative micro-fluctuation after implantable collamer lens and LASIK surgery for myopia

Abstract

Background To longitudinally analyze and compare the accommodative micro-fluctuation (MFs) and accommodative function between myopic patients after implantable collamer lens (ICL) implantation and laser in situ keratomileusis (LASIK). Methods Patients with good corrected visual acuity (20/20 or better) and underwent ICL (V4c) and LASIK for myopic-correction (ranging from − 3.50 to − 8.50 D) were recruited. Refraction, amplitude of accommodation (AMP), accommodative lag, higher-order aberration (HOA), and MFs were recorded before surgery and 1 and 3 months after surgery. The ACOMEREF automatic refractor was used to measure the high-frequency component (HFC) of the MFs, which suggested tension of the ciliary muscle. Results The study comprised 120 eyes. At 3 months after surgery, the manifest refractive spherical equivalent of the ICL and LASIK groups were − 0.11 and − 0.09 D, respectively (p = 0.46). HFC values were significantly higher at 1 month (p = 0.03) and 3 months postoperatively (p = 0.03) in the ICL group compared to that in the LASIK group. The ocular HOA of the ICL group was 1.08 ± 0.43 μm, which was lower than the LASIK group 1.45 ± 0.54 μm (p = 0.01). No significant differences in AMP and accommodative lag between groups were noted at 3 months postoperatively. There was a positive correlation between HFC and vault of the ICL lens (r2 = 0.14, p = 0.005). There were no correlations between HFC and ocular HOA and postoperative MRSE in the two groups (all p>0.05). Conclusions The HFC increased significantly after an early period of ICL implantation compared to laser in situ keratomileusis for myopic correction, which indicated increased tension of the ciliary muscle, and had a positive correlation on the vault of the ICL lens; However, studies with longer follow-up time and more structural evaluation are needed.

Analysis of the Changes and Possible Reasons in Aberrations before and after Surgery in Patients with Concomitant Exotropia

“…e integrity of tear film can affect higher-order aberration, and the unsmooth anterior corneal surface induced by tear film destruction is the key factor leading to the increase of HOAs [20][21][22][23][24]. Pupil diameter changes [25][26][27][28] and adjustments [29][30][31][32][33] can also cause changes in HOAs. erefore, we used fixed targets in our instruments and designed to control the patient's pupil diameter to eliminate the effect on HOAs measurement.…”

Long-term observation on safety and visual quality of implantable collamer lens V4c implantation for myopia correction: a 5-year follow-up

“…OPD Scan III is an aberrometer with Placido based on a shack Hartmann. The study of aberration using OPD Scan III has been applied in previous studies and has clinical significance, including studies in the 4 mm area [8][9] , with the help of Fourier transform, OQAS is designed according to the asymmetric pattern of the double-pass technology [10] . It is currently the only instrument that can be used to objectively measure the optimal aberration and the impact of human eye transparency loss.…”

Dynamics of Accommodative Asthenopia in Patients with Visually Intense Work after LASIK with Different Degrees of Myopia

“…В ранее проведенных исследованиях сообщалось о нарушениях аккомодационной и (или) бинокулярной функции глаза, связанных с послеоперационной анизометропией и роговичными осложнениями [6], однако в нашей работе данные факторы являлись критериями исключения пациентов из исследования. Более четкое и сопоставимое с представленными результатами настоящего исследования заключение было сформулировано в работах авторов, которые утверждают, что проведение ЛАСИК не оказывает существенного влияния на аккомодацию, при этом выявленные послеоперационные нарушения были диагностированы в рамках предоперационного обследования [24][25][26].…”