Comparison of Lang test, Randot test & Lang test, Randot test & TNO test TNO test in the assessment of stereo- acuity of normal population. Authors : Shalaka Paralkar, Mihir Kothari, Authors : Shalaka Paralkar, Mihir Kothari, Khushbu Shah Khushbu Shah E-Poster No. FP289 E-Poster Serial No.: 268
12
Embed
Lang test, Randot test & TNO test Comparison of Lang test, Randot test & TNO test in the assessment of stereo-acuity of normal population. Authors : Shalaka.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Comparison of
Lang test, Randot test & TNO test Lang test, Randot test & TNO test
in the assessment of stereo-acuity of normal population.
• We have no Financial interest in any of the products mentioned in this poster
• We have not received any financial assistance to carry out this study
Introduction
1 - Czepita D, Goslawski W, Mojsa A. Occurrence of anisometropia among students ranging from 6 to 18 years of age. Klin Oczna. 2005;107(4-6):297-9. 2 - Weber, JL; Wood, Joanne : Amblyopia: Prevalence, Natural History, Functional Effects and Treatment. Clinical and Experimental Optometry 88 (6)
Appropriate therapeutic measures can improve Appropriate therapeutic measures can improve the stereoacuity in such patients.the stereoacuity in such patients.
Aim
Methods and materials
Inclusion criteria
Best corrected visual acuity – 6/6
Orthotropic
Normal binocularity
Measured Stereoacuity•Using Lang test(Lang type 1 test), •Randot test and •TNO test:
with appropriate refractive correctionWith appropriate environmental lighting at reading distance ( 40 cm)
Results
• 46 consecutive patients • aged 19.3 years ± 7.2 (5-36) • 26 were females.All the patients had measurable stereopsis on these
tests.
Mean Stereoacuity:• Lang test = 550” • Randot test = 50” ± 36.8” (20-250)• TNO test = 60” ± 63” (15-240)
Correlation of Randot and TNO test
0
100
200
300
400
500
600
LANG
RANDOT
TNO
Discussion
• Performance on motor skills of a person is related to stereoacuity*
• Various methods have been used to assess stereoacuity in children.
• Some tests have made use of global stereopsis (TNO test,Frisby test, Lang test etc.) and some are based on local stereopsis (Titmus test, Randot test)
*O’Connor AR et al : The functional significance of stereopsis. Invest Ophthalmol Vis Sci. 2010 Apr;51(4):2019-23. Epub 2009 Nov 20.
Merits:
• Useful for screening in children.
• No glasses necessary
OUR EXPERIENCE:
•Easy to perform in children•Gives a general idea about presence of gross stereopsis•More convenient to use in unco-operative children as there is no requirement for glasses
Demerits:• Only gross stereopsis with Lang 1• Lang 2 required for finer stereopsis
Merits
• Can detect stereoacuity over a range of 20 to 500 seconds of arc
OUR EXPERIENCE
•Children could easily view the animal figures•Effectively gave an idea of the fine stereopsis
Demerits•Mono-ocular clues are present
Merits• Can measure
stereoacuity over a range of 15 to 480 seconds of arc
• No mono-ocular clues
OUR EXPERIENCE
•Easier to perform in children as compared to Randot test
Demerits• Crowding phenomenon may be seen• Dissociation may be present