Evaluation of the impact of persistent subepithelial corneal infiltrations on the visual performance and corneal optical quality after epidemic keratoconjunctivitis

2014 ◽  
Vol 93 (4) ◽  
pp. 377-382 ◽  
Author(s):  
Sevda Aydin Kurna ◽  
Ahmet Altun ◽  
Aynur Oflaz ◽  
Aysu Karatay Arsan
Keyword(s):  
Optical Quality ◽  
Visual Performance ◽  
Epidemic Keratoconjunctivitis ◽  
The Impact

scholarly journals Comparison of the visual performance of iris-fixated phakic lens and implantable collamer lens to correct high myopia

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Xiao-ling Jiao ◽  
Jun Li ◽  
Zhe Yu ◽  
Ping-hui Wei ◽  
Hui Song
Keyword(s):  
Visual Acuity ◽  
High Myopia ◽  
Optical Quality ◽  
Visual Performance ◽  
Quality Analysis ◽  
Modulation Transfer ◽  
Implantable Collamer Lens ◽  
Good Visual Acuity ◽  
Significant Difference ◽  
Group 6

Abstract Background To compare visual performance between the iris-fixated phakic intraocular len (pIOL) and implantable collamer len (ICL) to correct high myopia. Methods Twenty-four eyes underwent iris-fixated pIOL implantation and 24 eyes underwent ICL implantation. At the 6-month follow-up, the best-corrected visual acuity (BCVA) and uncorrected distance visual acuity (UDVA) were compared between the iris-fixated pIOL and ICL groups. The objective scatter index (OSI), modulation transfer function (MTF) cutoff, and ocular aberrations were performed to evaluate postoperative visual quality between the two groups. Results No significant difference was found in UDVA, BCVA, and spherical equivalent between the iris-fixated pIOL and ICL groups (P > 0.05). Six months after surgery, the following values were significantly higher in the ICL group than in the iris-fixated pIOL group: MTF cutoff, strehl ratio and optical quality analysis system values at contrasts of 9 %, 20 %, and 100 % (P < 0.01). The OSI in the iris-fixated pIOL group was higher than in the ICL group 6 months after surgery (P < 0.01). All high-order aberrations were slightly more severe in the iris-fixated pIOL group than in the ICL group 6 months after surgery, although only trefoil (P = 0.023) differed significantly in this regard. Conclusions Both iris-fixated lenses and ICLs can provide good visual acuity. ICLs confer better visual performance in MTF-associated parameters and induce less intraocular light scattering than iris-fixated pIOLs.

Light Up Your Life! The Impact of Task Lighting on Visual Performance and Quality of Life in Older Adults

2021 ◽  
Vol 75 (Supplement_2) ◽  
pp. 7512515308p1
Author(s):  
Martha Sanders ◽  
Caila Frassetto ◽  
Catherine Hill ◽  
Kyeana Martone ◽  
Niamh Butler
Keyword(s):  
Quality Of Life ◽  
Older Adults ◽  
Visual Performance ◽  
Task Lighting ◽  
The Impact

The Impact of Bilateral Subepithelial Corneal Infiltrates on Tear Film After Epidemic Keratoconjunctivitis

2019 ◽  
Vol 46 (5) ◽  
pp. 281-284 ◽  
Author(s):  
Ceyhun Arici ◽  
Pinar Sultan ◽  
Burak Mergen ◽  
Bulent Buttanri ◽  
Cezmi Dogan
Keyword(s):  
Tear Film ◽  
Epidemic Keratoconjunctivitis ◽  
Corneal Infiltrates ◽  
The Impact

Predicting visual performance from optical quality metrics in keratoconus

2009 ◽  
Vol 92 (3) ◽  
pp. 289-296 ◽  
Author(s):  
Paul Schoneveld ◽  
Konrad Pesudovs ◽  
Douglas J Coster
Keyword(s):  
Optical Quality ◽  
Quality Metrics ◽  
Visual Performance

scholarly journals Pupil Function in Pseudophakia: Proximal Miosis Behavior and Optical Influence

Photonics ◽  
2019 ◽  
Vol 6 (4) ◽  
pp. 114 ◽  
Author(s):  
Elsa Fonseca ◽  
Paulo Fiadeiro ◽  
Renato Gomes ◽  
Angel Sanchez Trancon ◽  
António Baptista ◽  
...  
Keyword(s):  
Pupil Size ◽  
Angular Size ◽  
Optical Quality ◽  
Individual Variability ◽  
Computer Simulation Model ◽  
Small Contribution ◽  
Distant Object ◽  
Object Distance ◽  
The Mean ◽  
The Impact

The pseudophakic eye lacks the ability to produce a refractive change in response to object proximity. Thus, individual anatomical features such as the pupil size play an important role in achieving functional vision levels. In this work, the range of pupil sizes at varying object distance was measured in pseudophakic participants. Furthermore, the impact of the measured values on eye optical quality was investigated using a computer simulation model. A binocular eye-tracker was used to measure the participants’ pupil sizes at six object distances, ranging from 0.33 m (i.e., vergence of 3.00 D) to 3.00 m (i.e., vergence of 0.33 D), while observing a Maltese cross with a constant angular size of 1 ∘ . In total, 58 pseudophakic participants were enrolled in this study (age mean ± standard deviation: 70.5 ± 11.3 years). The effects of object distance and age on pupil size variation were investigated using linear mixed effects regression models. Age was found to have a small contribution to individual variability. The mean infinite distance pupil size (intercept) was 4.45 ( 95 % CI: 2.74, 6.17) mm and the mean proximal miosis (slope) was − 0.23 ( 95 % CI: −0.53, 0.08) mm/D. The visual acuity (VA) estimation for a distant object ranged from − 0.1 logMAR (smallest pupil) to 0.04 logMAR (largest pupil) and the near VA ( 0.33 m) when mean proximal miosis was considered ranged from 0.28 logMAR (smallest pupil) to 0.42 logMAR (largest pupil). When mean distance pupil was considered, proximal miosis individual variability produced a variation of 0.04 logMAR for the near object and negligible variation for the distant object. These results support the importance of distance pupil size measurement for the prediction of visual performance in pseudophakia, while suggesting that proximal miosis has a negligible impact in VA variability.

Visual performance and optical quality with soft lenses in keratoconus patients

2012 ◽  
Vol 32 (2) ◽  
pp. 100-116 ◽  
Author(s):  
Amit Jinabhai ◽  
Hema Radhakrishnan ◽  
Cindy Tromans ◽  
Clare O’Donnell
Keyword(s):  
Optical Quality ◽  
Visual Performance
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