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Comparison of Lang test, Randot test & TNO test in the assessment of stereo-acuity of normal population . PowerPoint Presentation
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Comparison of Lang test, Randot test & TNO test in the assessment of stereo-acuity of normal population . Authors : Shalaka Paralkar , Mihir Kothari, Khushbu Shah. E-Poster No.  FP289 E-Poster Serial No.: 268. Disclaimer.

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slide1

Comparison of Lang test, Randot test & TNO test in the assessment of stereo-acuity of normal population.

Authors : ShalakaParalkar, Mihir Kothari, Khushbu Shah

E-Poster No.  FP289

E-Poster Serial No.: 268

slide2

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
introduction
Introduction

Appropriate therapeutic measures can improve the stereoacuity in such patients.

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)

methods and materials
Methods and materials
  • Measured Stereoacuity
  • Using Lang test(Lang type 1 test),
  • Randot test and
  • TNO test:
    • with appropriate refractive correction
    • With appropriate environmental lighting
    • at reading distance ( 40 cm)
results
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)
slide7

Correlation of Randot and TNO test

The correlation coefficient (Pearson’s r) for Randot test and TNO test = 0.66 – positive correlation

discussion
Discussion

stereo – solid

opsis – view or sight

  • 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)

Stereopsis

*O’Connor AR et al : The functional significance of stereopsis.

Invest Ophthalmol Vis Sci. 2010 Apr;51(4):2019-23. Epub 2009 Nov 20.

slide9

LANG TEST

  • Demerits:
  • Only gross stereopsis with
  • Lang 1
  • Lang 2 required for finer stereopsis

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
slide10

RANDOT TEST

  • Demerits
  • Mono-ocular clues are present

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
slide11

TNO TEST

  • Demerits
  • Crowding phenomenon may be seen
  • Dissociation may be 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
conclusion
Conclusion
  • Lang test, Randot test and TNO test are useful to assess stereopsis in patients.
  • The Lang test was the easiest test.
  • Randot and TNO test can assess much finer acuity over a large range of disparities. Both have a good correlation.

THANK YOU FOR YOUR ATTENTION