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Comparison of
Lang test, Randot test & TNO test Lang test, Randot test & TNO test
in the assessment of stereo-acuity of normal population.
Authors : Shalaka Paralkar, Mihir Kothari, Authors : Shalaka Paralkar, Mihir Kothari, Khushbu ShahKhushbu Shah
E-Poster No. FP289E-Poster Serial No.: 268
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Disclaimer
• 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
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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.
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Aim
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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)
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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)
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Correlation of Randot and TNO test
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LANG
RANDOT
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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.
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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
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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
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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
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Conclusion
THANK YOU FOR YOUR ATTENTION