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Objectives: To compare early subjective and objective vision quality of postoperative patients undergoing phacoemulsification cataract surgery combined with implantation of refractive segmental multifocal intraocular lens (MIOL) SBL-3 and apodized diffractive MIOL SN6AD1. Methods: As a prospective study, it enrolled 53 patients (53 eyes) to undergo phacoemulsification cataract surgery combined with MIOL implantation. According to differences in MIOL implanted, patients were divided into a SBL-3 group (25 eyes) and a SN6AD1 group (28 eyes). Ophthalmological evaluation included uncorrected (UDVA) and corrected (CDVA) distance visual acuities, uncorrected intermediate (UIVA) and near (UNVA) visual acuities, distance-corrected intermediate (DCIVA) and near (DCNVA)visual acuities and corrected near(CNVA) visual acuity, contrast sensitivity, modulation transfer function (MTF) and high order aberration (4 mm pupil diameter) at three months postoperatively. Moreover, a questionnaire survey was carried out to assess near spectacle independence, patient satisfaction and symptoms of visual disturbance. Results: At three months after surgery, UIVA and UNVA in the SBL-3 group are statistically significantly superior to those of the SN6AD1 group (P0.05). Conclusions: Both the two multifocal intraocular lens provided an excellent level of quality of vision three months postoperatively. However, the application effect of SBL-3 MIOL is superior to that of SN6AD1 MIOL as far as intermediate vision, near vision and contrast sensitivity are concerned. doi: https://doi.org/10.12669/pjms.36.7.3364 How to cite this:Lian H, Ma W, Wei Q, Yuan X. A comparative study on early vision quality after implantation of refractive segmental and diffractive multifocal intraocular lens. Pak J Med Sci. 2020;36(7):1607-1612. doi: https://doi.org/10.12669/pjms.36.7.3364 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Background: Laser-Assisted in situ Keratomileusis (LASIK) can induce corneal aberrations that can impact vision and patient satisfaction. Recent developments in laser technologies have helped minimise these aberrations. Objective: To assess the quality of vision and change in Higher-Order Aberrations (HOAs) following wavefront-optimized LASIK in low-myopic astigmatic patients. Methods: LASIK was performed on a total of 76 eyes in patients with myopia Results: Mean postoperative Spherical Equivalent (SE) was -0.09 ± 0.26 µm with 95% of patients within ± 0.5 D of attempted SE. Postoperative uncorrected distance visual acuity was 20/20 or better for 96% of patients. Contrast sensitivity increased against horizontal and vertical gratings at all spatial frequencies except for vertical gratings at 18 cycles/degree. Spherical aberration and total HOA increased by 0.085 µm and 0.13 µm respectively. The mean VF14 score increased from 89.2 ± 16.7% to 99 ± 1.4% postoperatively. Conclusion: LASIK performed using the WaveLight® EX500 excimer and WaveLight® FS200 laser platform provided improved contrast sensitivity and visual acuity with minimal introduction of HOAs, making it a suitable platform for low myopic astigmatic patients.

El objetivo de este estudio es evaluar los resultados visuales binoculares, incluyendo la calidad de visión (examinada por medio de la sensibilidad al contraste) y la satisfacción subjetiva en un grupo de pacientes implantados bilateralmente con un lente intraocular de PanOptix trifocal. Métodos: Este fue un estudio observacional, de cohorte retrospectiva Resultados: El total de 132 ojos, 66 pacientes con implante bilateral de lente trifocal PanOptix. La agudeza visual binocular no corregida de lejos (Avsc L) fue en promedio de 0,05 LogMAR (Snellen 20/22) , intermedia 65 cm (Avsc I) 0.07 (20/23 ), cercana 40 cm (AVscC) 0.05 LogMAR ( 20/22 ). La curva de desenfoque binocular mostró una meseta sin un pico claramente evidente en la agudeza visual en los desenfoques correspondientes a visión intermedia (entre -2.00 D y -1.00 D, correspondiendo en distancia al intervalo entre 50 cm y 1 metro) con una agudeza visual promedio de entre LogMAR 0.09 y LodMAR 0.08 Conclusion: EL lente intraocular trifocal PanOPTIX mostró resultados muy satisfactorios en este grupo de pacientes, que lograron independecia de las gafas y expresaron un alto nivel de satisfacción. Especialización The objective of this study is to evaluate binocular visual results, including the quality of vision (examined by contrast sensitivity) and subjective satisfaction in a group of patients implanted bilaterally with an intraocular PanOptix trifocal lens. Methods: This was an observational, retrospective cohort study. Results: The total of 132 eyes, 66 patients with bilateral PanOptix trifocal lens implant. Binocular uncorrected distance visual (UDVA) was on average 0.05 LogMAR (Snellen 20/22), intermediate 65 cm (UIVA) 0.07 (20/23), near 40 cm (UNVA) 0.05 LogMAR ( 20/22). The binocular defocus curve showed a plateau without a clearly evident peak in visual acuity in the defocus corresponding to intermediate vision (between -2.00 D and -1.00 D, corresponding in distance to the interval between 50 cm and 1 meter) with a visual acuity average between LogMAR 0.09 and LodMAR 0.08 Conclusion: The PanOPTIX trifocal intraocular lens showed very satisfactory results in this group of patients, who achieved independence of the glasses and expressed a high level of satisfaction.

Purpose To compare and analyze changes in vision quality, subjective symptoms, and psycho-social satisfaction in keratoconus and myopic patients following the wearing of contact lenses. Methods This study enrolled 25 keratoconus and 25 myopic patients with corrected vision over 0.8 according to the Snellen chart due to treatment with contact lenses. Patients were surveyed prior to the wearing of contact lenses, and again after three months of contact lens usage with a questionnaire about quality of vision and life. The changes in visual function, visual symptoms, and psycho-social well-being before and after contact lens usage were analyzed. Results The keratoconus patients' overall degree of satisfaction was higher than the overall degree of satisfaction of myopic patients, and the motivation for contact lens usage and purpose of contact lens treatment were different in the two groups. Keratoconus patients experienced greater changes in satisfaction, particularly in satisfaction during night activities, short-distance work, and the reading of fine print. Furthermore, they experienced fewer dry eye symptoms but greater foreign body sensations than patients with myopia following treatment with contact lenses. No statistically significant differences in social role functions existed between the two groups. Keratoconus patients had a lower expectation of visual acuity recovery before treatment with contact lenses (Mann-Whitney U-test, p = 0.049) compared to myopic patients, and more anxiety about vision loss following treatment (Wilcoxon signed-rank test, p = 0.018) compared to their level of anxiety about vision loss before treatment with contact lenses. Conclusions Although the same treatment was applied, keratoconus and myopic patients experienced different types of discomfort and areas of improvement in contact lens corrected vision. Therefore, not only corrected vision, but also subsequent improvement and discomfort outcomes should be considered by patients when choosing contact lens treatment. For patients with mild keratoconus, contact lens treatment may be an efficacious first treatment modality.