Background: Seth, a 16-year-old male student-athlete, suffered a concussion during trail riding in 2014 when his bike came apart during a jump. The patient's occupational therapist referred him for a vision examination and therapy following vestibular therapy. Unresolved post-concussion symptoms included headaches, problems seeing the ball in sports, and reading problems reminiscent of " dyslexia. "

Ophthalmology, 2000

Objective/Background: To describe the Refractive Status and Vision Profile (RSVP), a questionnaire that measures self-reported vision-related health status (symptoms, functioning, expectations, concern) in persons with refractive error.

Delhi Journal of Ophthalmology, 2019

In the current scenario of competition, paper writing, critical analysis and stardom, we forget to analyse the basics of the subject, one of which is a visual acuity standard. Being an ophthalmologist demands good understanding of visual acuity in all formats. This article emphasise on visual acuity conversions from logarithm to Snellen visual chart at 6 meter, 4 meter, 20 feet and decimal forms.

Journal of Glaucoma, 2007

Objective: To report the impact of visual field quality control (QC) procedures on the rates of visual field unreliability, test parameter errors, and visual field defects attributed to testing artifacts in the Ocular Hypertension Treatment Study (OHTS).

Modelling of the effect of defocus on the contrast sensitivity function (CSF) predicts a non-monotonically decreasing function characterised by multiple local minima (notches). 1, 2 The notches are a consequence of defocus and aberration on the modulation transfer function (MTF). A recent study by our group 1,2 demonstrated that, for 6mm pupils, the shape of defocussed CSFs and in particular the position (spatial frequency) and depth of notches could be predicted from the measured ocular aberration. Notches were well predicted and repeatable for hyperopic (negative) defocus, but predictions were less reliable for myopic (positive) defocus.

Ophthalmic and Physiological Optics, 1993

Revista Brasileira de Oftalmologia, 2015

Desempenho visual: validação do inventário de eficiência visual em estudantes

Eye & Contact Lens-science and Clinical Practice, 2018

To compare the visual acuity and refractive error using OPDIII and subjective findings in visually normal subjects. Method: This study was performed on 75 participants (134 eyes) with an age range of 18 to 35 years. Visual acuity was evaluated using both subjective Snellen chart and OPDIII devices. Also, OPDIII objective refraction was compared with subjective refraction. Paired t test was used to compare mean visual acuity and refractive error. The 95% limits of agreement (LOA s) were reported to evaluate the agreement between subjective and objective methods. Results: The mean Snellen visual acuity was 0.70560.243 logMAR in group with myopia and 0.37560.207 logMAR in group with hyperopia. Visual acuity obtained using OPDIII was 0.63260.270 and 0.05460.084 logMAR in groups with myopia and hyperopia, respectively. There was a significant difference in the mean visual acuity between OPDIII and Snellen chart. The correlation of the Snellen chart with OPDIII was 0.862 and 20.172 in myopic and hyperopic groups, respectively. The 95% LOA s of the OPDIII with Snellen chart were 20.33 to 0.18 and 20.14 to 0.79 logMAR in myopic and hyperopic patients, respectively. The mean spherical power obtained by OPDIII was more negative than that of subjective refraction (OPDIII mean difference 20.27260.335 and 0.16360.302 DS in myopic and hyperopic groups respectively), while the cylinder power was less than that of the subjective refraction (OPDIII mean difference 0.48860.566 and 0.03060.255 DC in groups with myopia and hyperopia, respectively). The correlation of OPDIII with subjective refraction was 0.905, 0.920 in measurement of the spherical power and 0.908, 0.928 in measurement of the cylinder power in groups with myopia and hyperopia, respectively. Conclusion: Visual acuity scores were significantly better using OPDIII compared with Snellen chart in group with myopia, whereas the Snellen chart provided the better visual acuity scores in hyperopic patients. Although the correlation of OPDIII with subjective refraction in measuring the refractive error was high, OPDIII showed a significant difference with subjective refraction.