Preliminary results of visual acuity testing in an African elephant

1997 ◽  
Author(s):  
Melissa R. Shyan ◽  
Jeff Peterson ◽  
Barbara Milankow ◽  
Robert H. I. Dale
Keyword(s):  
Visual Acuity ◽  
African Elephant ◽  
Preliminary Results ◽  
Visual Acuity Testing

scholarly journals Fixation Preference and Visual Acuity Testing in a Population-based Cohort of Preschool Children with Amblyopia Risk Factors

Ophthalmology ◽  
2009 ◽  
Vol 116 (1) ◽  
pp. 145-153 ◽  
Author(s):  
Susan A. Cotter ◽  
Kristina Tarczy-Hornoch ◽  
Erin Song ◽  
Jesse Lin ◽  
Mark Borchert ◽  
...  
Keyword(s):  
Risk Factors ◽  
Visual Acuity ◽  
Preschool Children ◽  
Population Based ◽  
Visual Acuity Testing ◽  
Fixation Preference

Comparison of structural, functional, tonometric, and visual acuity testing for glaucoma: a prospective diagnostic accuracy study

2021 ◽  
Author(s):  
Rajesh S. Kumar ◽  
B. Ramgopal ◽  
Mahalakshmi V. Rackenchath ◽  
Sathi Devi A V ◽  
Suria S. Mannil ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Diagnostic Accuracy ◽  
Diagnostic Accuracy Study ◽  
Accuracy Study ◽  
Visual Acuity Testing

A Survey of Visual Acuity Testing in the Infant and Preverbal Child

1984 ◽  
Vol 34 (1) ◽  
pp. 13-21 ◽  
Author(s):  
Arthur L. Rosenbaum ◽  
David G. Kirschen
Keyword(s):  
Visual Acuity ◽  
Visual Acuity Testing

Hyperopia Correction Using an Erodible Mask Excimer Laser Delivery System Coupled to an Axicon: Preliminary Results

1997 ◽  
Vol 7 (3) ◽  
pp. 203-210 ◽  
Author(s):  
R. Brancato ◽  
F. Carones ◽  
A. Morico ◽  
E. Venturi ◽  
L. Vigo ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Excimer Laser ◽  
Delivery System ◽  
Refractive Error ◽  
Large Area ◽  
Preliminary Results ◽  
Corrected Visual Acuity ◽  
Visual Acuity Loss ◽  
Age Range ◽  
Best Corrected Visual Acuity

Purpose. This paper presents the results of the first human trial on the correction of hyperopia using an erodible mask excimer laser delivery system coupled to an axicon. Methods. We treated 17 eyes of 17 patients (age range 34–62 years) for the correction of +3.21 ± 1.04 D (range +1.00 to +4.00 D). The hyperopic correction was made using an erodible mask inserted on the laser optical pathway, to produce a circular ablation measuring 6.5 mm in diameter. An axicon was then used to create a blend transition zone from 6.5 mm up to 9.4 mm in diameter. Eyes were evaluated at one, three and six months after surgery. Results. Reepithelization was always observed by the fifth postoperative day, despite the large area of deepithelization (diameter 9.5 mm). Mean refractive error one month after treatment was −2.44 ± 1.59 D (range 0.00 to −6.50 D). Five eyes (29.4%) had a best corrected visual acuity loss more than two to three lines; all eyes showed mild annular haze not involving the central part of the cornea. Six months after treatment, mean refractive error was −0.88 ± 0.99 D (range +0.50 to −3.00 D). Compared to preoperative status, 13 eyes (76.5%) showed an improvement in uncorrected distance visual acuity (1–8 lines), and 14 eyes (82.4%) showed an improvement in uncorrected vision at reading distance (3–7 lines). Two eyes (11.7%) showed a best corrected visual acuity loss of two of three lines. Conclusions. These preliminary results indicate this approach is effective in reducing hyperopia, while its predictability has still to be proved in a larger treatment group with longer follow-up. A cautious approach to this technique is still advisable, especially for higher hyperopic corrections, in view of the large best corrected visual acuity loss seen in two eyes at six months.

Pediatric Visual Acuity Testing

2022 ◽  
pp. 44-66
Author(s):  
Gayathri Srinivasan
Keyword(s):  
Visual Acuity ◽  
Scientific Evidence ◽  
Visual Behavior ◽  
Infants And Toddlers ◽  
Older Children ◽  
Commercial Products ◽  
Essential Component ◽  
Visual Acuity Testing ◽  
Set Up ◽  
Objective Visual Acuity

Visual acuity measurement is an essential component of any eye exam. In adults and older children, letter-based acuity (i.e., recognition acuity) is commonly used to measure vision. However, in infants and toddlers, performing traditional visual acuity testing is nearly impossible. Instead, modified optotypes such as gratings and pictures are shown to observe the young child's visual behavior. Additionally, there are objective visual acuity methods that negate the need for observing visual behavior. For the practicing clinician, the choices are many and can be confusing. With new commercial products coming into the market every day, it is nearly impossible to comprehensively cover each one of them. Instead, in this chapter, commonly used and/or studied visual acuity tests are covered. For each test, the set-up, procedure, documentation, and scientific evidence supporting or negating its use are discussed.

Parent-administered visual acuity testing: Is it reliable and can it improve office efficiency?

2004 ◽  
Vol 8 (4) ◽  
pp. 332-337 ◽  
Author(s):  
Evelyn A. Paysse ◽  
Larissa Camejo ◽  
Mohamed A.W. Hussein ◽  
David K. Coats
Keyword(s):  
Visual Acuity ◽  
Visual Acuity Testing
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