Results 91 to 100 of about 42,485 (232)

Evaluating three different methods of determining addition in presbyopia

open access: yesJournal of Ophthalmic & Vision Research, 2016
Purpose: To compare three different methods for determining addition in presbyopes. Methods: The study included 81 subjects with presbyopia who aged 40-70 years.
Negareh Yazdani   +5 more
doaj   +1 more source

The influence of near point of convergence training on the accommodative facility [PDF]

open access: yes, 2017
El propòsit d’aquest estudi pilot era determinar si entrenant el punt pròxim de convergència utilitzant el mètode del push-up durant 3 minuts, la flexibilitat acomodativa millorava per la seva relació d’associació.
Figuls Riu, Maria
core  

Electrical Conductivities of Conductors, Semiconductors, and Their Mixtures at Elevated Temperatures

open access: yesAdvanced Engineering Materials, EarlyView.
This article presents a comprehensive review of temperature‐dependent electrical conductivity data for multiple material classes at elevated temperatures, highlighting a persistent conductivity gap between metals and semiconductors in the range of 102$\left(10\right)^{2}$– 107$\left(10\right)^{7}$ S/m. Metal–ceramic irregular metamaterials are proposed
Valentina Torres Nieto, Marcia A. Cooper
wiley   +1 more source

Accommodative amplitude using the minus lens at different near distances

open access: yesIndian Journal of Ophthalmology, 2017
Purpose: The purpose of this study was to compare the mean findings and the repeatability of the minus lens (ML) amplitude of accommodation (AA) at 33 cm and 40 cm.
Hamed Momeni-Moghaddam   +4 more
doaj   +1 more source

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

open access: yesAdvanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal   +2 more
wiley   +1 more source

Accommodative Insufficiency: Prevalence, Impact and Treatment Options

open access: yesClinical Optometry, 2020
Jameel Rizwana Hussaindeen,1,2 Amirthaa Murali2 1Binocular Vision Clinic, Sankara Nethralaya, Unit of Medical Research Foundation, Sankara Nethralaya, Chennai 600006, India; 2Elite School of Optometry (in Collaboration with SASTRA Deemed University ...
Hussaindeen JR, Murali A
doaj  

Focused and defocused retinal images with Bessel and axicon pupil functions. [PDF]

open access: yes, 2020
Retinal image light distributions in a standard optical model of a diffraction-limited eye with round pupils are presented for several patterns of amplitude and phase modulation of the light admitted into the eye.
Westheimer, Gerald
core  

Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere

open access: yesAdvanced Engineering Materials, EarlyView.
In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May   +9 more
wiley   +1 more source

The distribution of negative and positive relative accommodation and their relationship with binocular and refractive indices in a young population

open access: yesJournal of Current Ophthalmology, 2017
Purpose: To determine the distribution of negative relative accommodation (NRA) and positive relative accommodation (PRA) and its relationship with binocular vision indices in a young population.
AbbasAli Yekta   +6 more
doaj   +1 more source

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