scholarly journals Ocular wavefront aberrations in acute central serous chorioretinopathy

2021 ◽  
Vol 9 (1) ◽  
pp. 33-33
Author(s):  
Banafsheh Kharrazi Ghadim ◽  
Nazli Taheri ◽  
Mohammad Reza Niyousha
Keyword(s):  
Visual Acuity ◽  
Root Mean Square ◽  
Central Serous Chorioretinopathy ◽  
Spherical Aberration ◽  
Optical Parameters ◽  
Average Height ◽  
Mean Square ◽  
Pupillary Dilation ◽  
Foveal Thickness ◽  
Wavefront Aberrations

Background: Central serous chorioretinopathy (CSCR) is a condition of choroidal and retinal pathologies that may affect vision, so we assessed vision by the ocular wavefront in the acute form of CSCR. Methods: This cross-sectional study included 21 cases (16-male, 5-female) of acute onset CSCR was referred to the retina clinic of Nikookari Eye Hospital. Visual acuity and ocular examination with and without pupillary dilation record. Central macular thickness and sub-foveal fluid height of all patients measured by spectral-domain optical coherence tomography (SD-OCT). All of them fulfilled binocular visual function analyzer by Tracy Technology after complete pupillary dilation. The items such as spherical equivalent, total root mean square, total lower-order aberration, total higher-order aberration, defocus, astigmatism, secondary astigmatism, coma, spherical aberration, trefoil, Strehl ratio in point spread function, the average height in the modulation transfer function, and root mean square error registered. Generalized Estimation Equations (GEE) were used to compare two groups of affected CSCR and normal contralateral eyes. Results: The mean uncorrected distance visual acuity in the CSCR eyes is (Decimal Notation) 0.82±0.17 and in the contralateral eyes is 0.95±0.09 (P=0.002). Analysis of macular OCT data CSCR group represents: central foveal thickness 485.9±165.12 μm and mean fluid height 284.3±165.42 μm. The mentioned optical parameters of ocular wavefront aberrations do not have significantly different results in the two groups. Conclusion: Our study showed CSCR reduced uncorrected visual acuity but it did not detect significant ocular wavefront changes in acute CSCR

scholarly journals Correlation analysis of wavefront aberrations and accommodations in myopia and hyperopia

2018 ◽  
Vol 64 (1) ◽  
Author(s):  
Elena Tarutta ◽  
Sona Harutyunyan ◽  
Anusch Khandzhyan ◽  
Narine Khodzhabekyan
Keyword(s):  
Correlation Analysis ◽  
Root Mean Square ◽  
Spherical Aberration ◽  
Higher Order ◽  
Mean Square ◽  
Optical Aberrations ◽  
Wavefront Aberrations

ABSTRAKTWstęp: Celem badania było przeprowadzenie analizy porównawczej dotyczącej akomodacji, pseudoakomodacji (PA) i aberracji wyższego rzędu (higher order optical aberrations – HOA) u dzieci oraz młodzieży z krótkowzrocznością i nadwzrocznością.Materiały i metody: W badaniu wzięło udział 88 pacjentów w wieku 5–24 lat (średnia 12,5 ±0,7). Zbadano 123 oczu z krótkowzrocznością (średnia −5,27 ±1,6 D) i 53 oczu z nadwzrocznością (średnia +3,1 ±1,15 D). Dokonano pomiaru obiektywnej odpowiedzi akomodacyjnej i względnej rezerwy akomodacyjnej. Wartość amplitudy pseudoakomodacyjnej (pseudoaccomodation amplitude – PA) oszacowano na podstawie różnicy między obliczoną mocą dodatkowej soczewki +3.0 D a najmniejszą mocą soczewki dodatniej umożliwiającą czytanie po wywołaniu cykloplegii (1% chlorowodorku cyklopentolanu × 2) z odległości 33 cm. Obliczono również wartości aberracji wyższego rzędu (średni kwadrat reszt, root mean square – RMS), pionowego i poziomego trefoil, pionowej i poziomej coma (coma7, coma8), oraz aberracji sferycznej (spherical aberration – SA).Wyniki: Obiektywne i subiektywne parametry akomodacji były znacząco niższe w krótkowzroczności niż w dalekowzroczności, natomiast wartości aberracji fali (RMS HOA, pionowy trefoil, coma7) oraz PA były znacząco wyższe. Stwierdzono różnice w zależnościach między parametrami aberracji i akomodacji w krótkowzroczności i nadwzroczności. W przypadku krótkowzroczności wykazano dodatnią korelację między RMS oraz pionową coma i akomodacją, natomiast pionowy trefoil oraz SA były dodatnio skorelowane z PA. W nadwzroczności stwierdzono dodatnią korelację między wartością pionowego trefoil a akomodacją oraz PA, odwrotną korelację między pionową coma a PA, oraz odwrotną korelację między poziomym trefoil i SA a akomodacją.Porównanie pacjentów krótkowzrocznych i nadwzrocznych wykazało odmienne zależności między aberracją sferyczną mierzoną po wywołaniu cycloplegii a akomodacją. Nie stwierdzono zależności między krótkowzrocznością a obiektywną odpowiedzią akomodacyjną, natomiast zaobserwowano dodatnią korelację z wartością PA. Nadwzroczność była ujemnie skorelowana z obiektywną odpowiedzią akomodacyjną, jednak nie stwierdzono zależności z wartością PА. U osób krótkowzrocznych zaobserwowano istotnie wyższe wartości SA oraz szerszą amplitudę PA. Natomiast w nadwzroczności wartość SA malała istotnie w kierunku wartości ujemnych przy wyższej amplitudzie PA.Wnioski: W krótkowzroczności stwierdzono obniżenie parametrów akomodacji oraz podwyższenie wartości HOA i PA. Porównanie oczu krótkowzrocznych i nadwzrocznych wykazało zróżnicowane powiązania między parametrami akomodacji oraz fali. Stwierdzone cechy należy uwzględnić przy opracowywaniu metod korekcji ukierunkowanych na refraktogenezę.

scholarly journals Simultaneous Transepithelial Topography-Guided Photorefractive Keratectomy and Accelerated Cross-Linking in Keratoconus: 2-Year Follow-Up

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Sibel Ahmet ◽  
Alper Ağca ◽  
Dilek Yaşa ◽  
Ahmet Alperen Koç ◽  
Mesut Toğaç ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Root Mean Square ◽  
Spherical Aberration ◽  
Case Series ◽  
Photorefractive Keratectomy ◽  
Cross Linking ◽  
Mean Square ◽  
Retrospective Case ◽  
Manifest Refraction

Purpose. To evaluate the visual, refractive, and topographic outcomes after simultaneous topography-guided transepithelial photorefractive keratectomy (transepithelial TG-PRK) using the Amaris Excimer laser platform and accelerated corneal cross-linking (CXL) in eyes with keratoconus.Materials and Methods. Patients with 2 years of follow-up were included in this retrospective case series. Manifest refraction (MR), uncorrected (UDVA) and corrected (CDVA) distance visual acuity, corneal topography, and pachymetry were evaluated at 1, 3, 6, 12, and 24 months after surgery. The root-mean-square of total higher-order aberrations (total HOA-RMS), coma (Coma-RMS), and spherical aberration (SA-RMS) were calculated for 4- and 6-mm diameters.Results. Forty-six eyes of 46 patients were included in the study. Stromal ablation was ≤50μin all patients. MR was −3.78±3.26 preoperatively and −1.39±1.82 postoperatively. Significant improvements were seen in the UDVA and Coma-RMS values at 1 month, CDVA and total HOA-RMS values at 3 months, and SA-RMS values at 1 year compared to preoperative levels. UDVA values further improved after 2 years, compared to the 1-year values. No patient lost two or more lines and keratoconus progression was not observed in any patient.Conclusion. Simultaneous transepithelial TG-PRK and accelerated CXL resulted in significant gains in CDVA without compromising CXL efficacy.

scholarly journals Small Incision Lenticule Extraction (SMILE) for Moderate and High Myopia: Seven-Year Outcomes of Refraction, Corneal tomography and Wavefront Aberrations

2019 ◽  
Author(s):  
Fei Xia ◽  
Yang Shen ◽  
Tian Han ◽  
Jing Zhao ◽  
Hai-Peng Xu ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Spherical Aberration ◽  
Case Series ◽  
Final Visit ◽  
Small Incision Lenticule Extraction ◽  
Wavefront Aberrations ◽  
Distance Visual Acuity ◽  
Small Incision ◽  
Uncorrected Distance Visual Acuity ◽  
Lenticule Extraction

Abstract Background To investigate the long-term corneal stability and wavefront aberrations after small incision lenticule extraction (SMILE) for moderate and high myopia.Methods Prospective, non-consecutive case series. A total of 26 patients (42 eyes) who underwent SMILE from May 2010 to March 2013 at the Fudan University Eye and ENT Hospital (Shanghai, China) were enrolled. The periods of follow-up were 1 month, 1 year, 5 years and 7 years after surgery. The routine eye examinations included uncorrected distance visual acuity (UDVA) and corrected distance visual acuity (CDVA), manifest refraction and corneal topography.Results All surgeries were executed without any complications. At the final visit, a UDVA of 20/20 or better was achieved in 42 eyes (100%), 21 eyes (50%) exhibited no change in CDVA. 15 eyes (36%) gained one line, 6 eyes (14%) gained two lines, and no eyes lost CDVA lines. 93% and 100% of eyes were within ±0.5 D and ±1.00 D of the target refraction, respectively. A mean refractive regression of -0.17 D was observed between 1 month and 7 years postoperatively. Mean corneal front curvature (KMF) were significantly increased between pre- and post-SMILE surgery (P<0.0001). Higher-order aberrations (HOAs) and vertical coma were significantly increased after SMILE compared to those measured before surgery (all P<0.001). There were no significant differences in horizontal coma, trefoil and spherical aberration between pre- and post-SMILE surgery (all P>0.05).Conclusions SMILE is an effective, safe and stable procedure for myopia correction, with relatively constant corneal stability and wavefront aberrations.

A randomized clinical trial comparing prompt photodynamic therapy with 3 months observation in patients with acute central serous chorioretinopathy with central macular leakage

2020 ◽  
pp. 112067212091516
Author(s):  
Tom OAR Missotten ◽  
Johan G Hoddenbach ◽  
Christine AE Eenhorst ◽  
L Ingeborgh van den Born ◽  
José P Martinez Ciriano ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Photodynamic Therapy ◽  
Central Serous Chorioretinopathy ◽  
Primary Outcome ◽  
Optic Disk ◽  
Foveal Thickness ◽  
Central Foveal Thickness ◽  
Group I ◽  
Acute Central Serous Chorioretinopathy ◽  
Group Ii

Purpose: The purpose of the study was to demonstrate whether photodynamic therapy in patients with acute central serous chorioretinopathy, with the leakage point within one optic disk diameter from the fovea, can be safely deferred. Methods: A single-center, randomized, controlled trial was conducted. Patients were randomized to photodynamic therapy within a week after presentation (Group I, 26 patients) or observation during 3 months (Group II, 26 patients). If leakage or subretinal fluid was observed during any control visit, photodynamic therapy was performed (again) within a week. Primary outcome: Primary outcome was change of visual acuity (Early Treatment Diabetic Retinopathy Study) after 12 months. Secondary outcomes were visual acuity, central foveal thickness, metamorphopsia, and color discrimination. Results: Photodynamic therapy procedures: group I, 26 at baseline, 2 retreatments at 3 months; group II, 10 at 3 months, 1 at 6 months (2 subjects refusing treatment), 2 retreatments at 6 months. At 12 months, mean visual acuity of all patients had improved by 6.5 letters (P < 0.001), mean central foveal thickness was 172 µm less (P < 0.001). After photodynamic therapy, visual acuity recovered faster and metamorphopsia significantly improved (3 months, P < 0.001). Differences between groups at 12 months were not significant. Conclusion: The (intended) number of photodynamic therapy (re)treatments in group II (n = 15) was 46% less than in group I (n = 28). Visual acuity and central foveal thickness at 12 months were similar. Therefore, the preferred management of acute central serous chorioretinopathy at presentation appears to be observation for 3 months.

scholarly journals The effect of cross-linking procedure on corneal wavefront aberrations in patients with keratoconus - with literature review

2021 ◽  
pp. 79-79
Author(s):  
Mirko Resan ◽  
Zeljka Cvejic ◽  
Philipp Baenninger ◽  
Farhad Hafezi ◽  
Horace Massa ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Energy Density ◽  
Spherical Aberration ◽  
Treatment Method ◽  
Cross Linking ◽  
Wavefront Aberrations ◽  
Corrected Visual Acuity ◽  
Potential Improvement ◽  
The Impact ◽  
Best Corrected Visual Acuity

Background/Aim: The aim of our study was to assess the impact of cross-linking (CXL) on the keratoconus regarding higher-order aberrations (HOAs) and potential improvement of visual function. Methods: In 19 patients a standard epithelium-off CXL was performed with an energy density of 3 mW/cm2 for half an hour. The cornea was examined by Pentacam topography before, one and six months after CXL. Best-corrected visual acuity (BCVA), topographic data and aberrations were collected. Results: A significant reduction in vertical coma was observed from preoperative -1.03 ? 1.89 to -0.74 ? 1.73 (p=0.004) 6 months after CXL, and in spherical aberration from preoperative -0.22 ? 1.05 to -0.08 ? 1.13 (p=0.002) 6 months after CXL. RMS-HOA 6 months after CXL also showed a significant reduction from 2.31 ? 1.82 to 2.26 ? 1.84 6 months after CXL (p=0.001). BCVA improved from preoperative 0.43 ? 0.15 to 0.71 ? 0.19 6 months after surgery (p<0.001). Conclusion: CXL is a very potent treatment method for keratoconus, which significantly reduces certain corneal wavefront aberrations, especially vertical coma, spherical aberration and RMS, and leads to a significant improvement in visual acuity.

scholarly journals Changes in functional, anatomical and optical parameters of the eye in children with habitually excessive accommodation stress and pseudomyopia after regular badminton playing

2019 ◽  
Vol 12 (4) ◽  
pp. 51-63
Author(s):  
E. P. Tarutta ◽  
N. A. Tarasova ◽  
G. A. Markosian ◽  
S. V. Milash ◽  
S. G. Harutyunyan ◽  
...  
Keyword(s):  
Blood Flow ◽  
Visual Acuity ◽  
Choroidal Thickness ◽  
Ophthalmic Artery ◽  
Spherical Aberration ◽  
Blood Flow Rate ◽  
Optical Parameters ◽  
Manifest Refraction ◽  
Uncorrected Visual Acuity ◽  
Retinal Artery

Purpose. To study the state of refraction, accommodation, and blood flow in eye vessels of children with habitually excessive accommodation stress (HEAS) and pseudomyopia practicing badminton.Material and methods. The study involved 11 patients (20 eyes) aged 7 to 11 years (average M±SD: 9.24 ± 1.06 years) with pseudomyopia and HEAS: 4 patients with myopia (7 eyes), 3 children with hyperopia (6 eyes), 4 children with emmetropia (7 eyes) before they started practicing badminton and after playing it for a certain time. All patients were tested for visual acuity, subjective and objective accommodation, optical biometry, aberrometry, velocity of blood flow in eye vessels, and choroidal thickness.Results. After 1 year of regular badminton workout, the subjects revealed a 0.92 ± 0.82 D weakening of manifest refraction, a decrease in accommodation tone by 0.85 ± 0.77 D, an increase in blood flow rate in ophthalmic artery and the central retinal artery, an increase in positive spherical aberration, a decrease in aberrations associated with mismatch and irregularity ofoptical system elements (tilt, trefoil, coma), which indirectly indicates a strengthening of the ligamentous apparatus of the lens.Conclusion. Practicing sports (badminton) contributes to the elimination of pseudomyopia, improvement of uncorrected visual acuity, accommodative ability, and ophthalmic hemodynamics indicators.

scholarly journals Effect of Intraocular Lens Tilt and Decentration on Visual Acuity, Dysphotopsia and Wavefront Aberrations

Vision ◽  
2020 ◽  
Vol 4 (3) ◽  
pp. 41 ◽  
Author(s):  
Zahra Ashena ◽  
Sundas Maqsood ◽  
Syed Naqib Ahmed ◽  
Mayank A. Nanavaty
Keyword(s):  
Visual Acuity ◽  
Visual Function ◽  
Negative Impact ◽  
Spherical Aberration ◽  
Visual Outcome ◽  
Intraocular Lenses ◽  
Wavefront Aberrations ◽  
Complicated Cataract ◽  
Toric Iols ◽  
Intraocular Lens Tilt

Tilt and decentration of intraocular lenses (IOL) may occur secondary to a complicated cataract surgery or following an uneventful phacoemulsification. Although up to 2–3° tilt and a 0.2–0.3 mm decentration are common and clinically unnoticed for any design of IOL, larger extent of tilt and decentration has a negative impact on the optical performance and subsequently, the patients’ satisfaction. This negative impact does not affect various types of IOLs equally. In this paper we review the methods of measuring IOL tilt and decentration and focus on the effect of IOL tilt and decentration on visual function, in particular visual acuity, dysphotopsia, and wavefront aberrations. Our review found that the methods to measure the IOL displacement have significantly evolved and the available studies have employed different methods in their measurement, while comparability of these methods is questionable. There has been no universal reference point and axis to measure the IOL displacement between different studies. A remarkably high variety and brands of IOLs are used in various studies and occasionally, opposite results are noticed when two different brands of a same design were compared against another IOL design in two studies. We conclude that <5° of inferotemporal tilt is common in both crystalline lenses and IOLs with a correlation between pre- and postoperative lens tilt. IOL tilt has been noticed more frequently with scleral fixated compared with in-the-bag IOLs. IOL decentration has a greater impact than tilt on reduction of visual acuity. There was no correlation between IOL tilt and decentration and dysphotopsia. The advantages of aspheric IOLs are lost when decentration is >0.5 mm. The effect of IOL displacement on visual function is more pronounced in aberration correcting IOLs compared to spherical and standard non-aberration correcting aspherical IOLs and in multifocal versus monofocal IOLs. Internal coma has been frequently associated with IOL tilt and decentration, and this increases with pupil size. There is no correlation between spherical aberration and IOL tilt or decentration. Although IOL tilt produces significant impact on visual outcome in toric IOLs, these lenses are more sensitive to rotation compared to tilt.

scholarly journals Small Incision Lenticule Extraction (SMILE) for Moderate and High Myopia: Seven-Year Outcomes of Refraction, Corneal Tomography, and Wavefront Aberrations

2020 ◽  
Vol 2020 ◽  
pp. 1-7 ◽  
Author(s):  
Fei Xia ◽  
Yang Shen ◽  
Tian Han ◽  
Jing Zhao ◽  
Haipeng Xu ◽  
...  
Keyword(s):  
Visual Acuity ◽  
High Myopia ◽  
Spherical Aberration ◽  
Final Visit ◽  
Small Incision Lenticule Extraction ◽  
Wavefront Aberrations ◽  
Distance Visual Acuity ◽  
Small Incision ◽  
Lenticule Extraction ◽  
Corneal Tomography

Purpose. To investigate the long-term outcomes of refraction, corneal tomography, and wavefront aberrations after small incision lenticule extraction (SMILE) for moderate and high myopia. Methods. Prospective, nonconsecutive case series. A total of 26 patients (26 eyes) who underwent SMILE from May 2010 to March 2013 at the Fudan University Eye and ENT Hospital (Shanghai, China) were enrolled. The periods of follow-up were 1 month, 1 year, 5 years, and 7 years after surgery. The routine eye examinations included uncorrected distance visual acuity (UDVA) and corrected distance visual acuity (CDVA), manifest refraction, and corneal tomography. Results. All surgeries were executed without any complications. At the final visit, an UDVA of 20/20 or better was achieved in 26 eyes (100%) and 11 eyes (42%) exhibited no change in CDVA. 9 eyes (35%) gained one line, 6 eyes (23%) gained two lines, and no eyes lost CDVA. 24 eyes (92%) and 26 eyes (100%) were within ±0.5 D and ±1.00 D of the target refraction, respectively. A mean refractive regression of −0.17 D was observed between 1 month and 7 years postoperatively. Mean corneal front curvature (MCFC) was significantly decreased between pre- and post-SMILE surgery (P<0.0001). Higher-order aberrations (HOAs) and vertical coma were significantly increased after SMILE compared to those measured before surgery (all P<0.001). There were no significant differences in trefoil and spherical aberration between pre- and post-SMILE surgery (all P>0.05). Conclusion. SMILE is an effective, safe, and stable procedure for moderate and high myopia, with relatively constant corneal stability and wavefront aberrations. This trial is registered with ChiCTR-ONRC-13003114.

Visual Acuity as a Function of Zernike Mode and Level of Root Mean Square Error

2003 ◽  
Vol 80 (2) ◽  
pp. 97-105 ◽  
Author(s):  
RAYMOND A. APPLEGATE ◽  
CHARLES BALLENTINE ◽  
HILLERY GROSS ◽  
EDWIN J. SARVER ◽  
CHARLENE A. SARVER
Keyword(s):  
Visual Acuity ◽  
Root Mean Square Error ◽  
Mean Square Error ◽  
Root Mean Square ◽  
Mean Square

Effect of intracorneal ring segment implantation on high order aberrations comparing patients with eccentric versus central keratoconus

2021 ◽  
pp. 112067212110410
Author(s):  
Philipp Anders ◽  
Lisa-Marie Anders ◽  
Mohamed Elalfy ◽  
Samer Hamada ◽  
Berthold Seitz ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Significant Positive Correlation ◽  
Spherical Aberration ◽  
High Order ◽  
Visual Performance ◽  
Mean Square ◽  
Ring Segment ◽  
Intracorneal Ring Segment ◽  
High Order Aberrations

Purpose: To assess potential differences between central and eccentric cones in the aberrometric corneal profile and in visual and keratometric outcomes 6 months after intracorneal ring segment (ICRS) implantation for keratoconus. Methods: This study compared two groups consisting of 12 patients each, with central or eccentric keratoconus who were treated with femtosecond laser-assisted Keraring implantation. Uncorrected (UDVA) and corrected (CDVA) distance visual acuity, keratometric readings and higher order aberrations (HOAs) including high order aberrations root mean square (HOARMS), coma, spherical aberration and trefoil were measured preoperatively and 6 months after ICRS implantation. Results: Trefoil and spherical aberration were significantly reduced after ICRS implantation compared to preoperative values in eccentric keratoconus (Trefoil, p = 0.0049; Spherical aberration, p < 0.0001). In central keratoconus spherical aberration was reduced not significantly after ICRS implantation compared to preoperative values ( p = 0.087). Coma showed a significant reduction in central ( p = 0.0001) and in eccentric keratoconus ( p = 0.0001). The reduction of spherical aberration in central keratoconus was significantly positively correlated to improvement in UDVA (Pearson’s correlation coefficient, r = −0.66; p = 0.02). In eccentric keratoconus there was a significant positive correlation between reduction of trefoil and improvement in UDVA (Spearmans R, r = −0.69; p = 0.01). Conclusion: Patients both with central and eccentric keratoconus benefit from ICRS implantation. Specifically, our data provide a slightly higher gain in visual performance for eccentric cones 6 month after ICRS implantation, which is accentuated by a greater reduction in spherical aberration and trefoil. Improvements in UDVA are positively correlated with reductions in HOAs.

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