Journals / Bakırköy Tıp Dergisi / 2011 / Cilt: 7 - Sayı: 2

Contrast sensitivity functions in the normal eyes of amblyopia

Ambliyopide sağlam gözde kontrast duyarlılık fonksiyonları

Pages
60–63
DOI
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⚡ TL;DR(Too Long; Didn't Read)

We believe in that the assessment of contrast sensitivity functions can provide important information on the visual function and can be useful in follow-up of amblyopic patients.

📌 3 Key Takeaways

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Objective & Hypothesis:Objective: To evaluate the contrast sensitivity functions in good eyes of strabismic and anisometropic amblyopic subjects.
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Key Findings & Data:Material and methods: Contrast sensitivity was assessed on both eyes of 20 strabismic, 20 anisometropic amblyopic and 10 normal control patients.
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Conclusion & Impact:We believe in that the assessment of contrast sensitivity functions can provide important information on the visual function and can be useful in follow-up of amblyopic patients.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Objective: To evaluate the contrast sensitivity functions in good eyes of strabismic and anisometropic amblyopic subjects. Material and methods: Contrast sensitivity was assessed on both eyes of 20 strabismic, 20 anisometropic amblyopic and 10 normal control patients. Contrast sensitivity was measured with Functional Acuity Contrast Test. Correlation analysis and student t test was used for statistical analysis. Results: Mean age was 8,9 in strabismic ambliyopes 8,7 in anisometropic ambliyopes and 12,3 in control group (p>0,05). Mean corrected visual acuity for amblyopic eyes was 0,46 in strabismic ambliyopes and 0,41 in anisometropic ambliyopes (p>0,05). Contrast sensitivity functions from good eyes demonstrated lower values compared with control patients (p>0,05). While normal contrast sensitivity function in low spatial frequencies on good eyes was measured, decreased contrast sensitivity values in high spatial frequencies on good eyes were measured in 50% (10 cases) of strabismic amblyopes and 70% (14 cases) of anisometropic amblyopes (p>0,05). Conclusion: We conclude that the good eye is not normal and there was no statistically significant difference in contrast sensitivity values between strabismic and anisometropic amblyopes. We believe in that the assessment of contrast sensitivity functions can provide important information on the visual function and can be useful in follow-up of amblyopic patients.

Özet

Amaç: Strabismik ve anizometropik ambliyop olgularda sağlam gözde kontrast duyarlılık fonksiyonlarının değerlendirilmesi. Gereç ve Yöntem: Kontrast duyarlılık fonksiyonları 20 strabismik, 20 anizometropik ambliyop hasta ve 10 normal kontrol grubundaki olguların her iki gözünde değerlendirildi. Kontrast duyarlılık, “Functional Acuity Contrast Test” ile ölçüldü. Tüm sonuçlar istatistiksel olarak korelasyon analizi ve ki-kare testi ile incelendi. Bulgular: Yaş ortalaması strabismik ambliyoplarda 8,9 anizometropik ambliyopda 8,7 kontrol grubunda 12,3 idi (p>0,05). Olguların tashihli görme keskinliği ortalaması amblyopik göz için strabismik ambliyoplarda 0,46, anizometropik ambliyoplarda ise 0,41 idi (p>0,05). Sağlam gözlerdeki kontrast duyarlılık fonksiyonları kontrol hastaları ile karşılaştırıldığında daha düşük değerler gösterdi (p>0,05). Sağlam gözlerde düşük uzaysal frekanslarda normal sınırlarda kontrast duyarlılık ölçülürken yüksek uzaysal frekanslarda ise strabismik ambliyopların %50’sinde (10 olgu), anizometropik ambliyopların %70’inde (14 olgu) azalma saptandı (p>0,05). Sonuç: Amblyop olguların sağlam gözlerinin normal olmadığı şaşı ve anizometrop amblyoplar arasında kontrast duyarlılık seviyesinde anlamlı fark olmadığı sonucuna vardık. kontrast duyarlılık fonksiyonlarının değerlendirilmesi görme fonksiyonları ile ilgili önemli bilgi sağlamakta olup amblyop hastaların takibinde faydalı olabileceğine inanmaktayız.

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Cite This Article

TUĞCU, B., GÜREZ, C., YÜZBAŞIOĞLU, E., AĞAÇHAN, A., YİĞİT, U. (2011). Contrast sensitivity functions in the normal eyes of amblyopia. Bakırköy Tıp Dergisi, Cilt: 7 - Sayı: 2, 60–63. https://ajindex.com/articles/129444

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References (18)

  1. Duke-Elder WS (Ed). Systems in In Ophthalmology, St Louis, Mosby Co; 1949; 4: 3839
  2. Rogers GL, Bremer DL, Leguire LE. The contrast sensitivity function and childhood amblyopia. Am J Ophthalmoly 1987; 104: 64-68
  3. Regan D, Neima D. Low-contrast letter charts in early diabetic retinopathy, ocular hypertension, glaucoma and Parkinson’s disease. Br J Ophthalmol 1984; 68: 885-889
  4. Bradley A, Freeman RD. Contrast sensitivity in anisometropic amblyopia. Invest Ophthalmol Vis Sci 1981; 21: 467-476
  5. Levi DM, Klein SA. Vernier acuity, crowding and amblyopia. Vision Res 1985; 25: 979-991
  6. Holopigian K, Blake R. Spatial vision in strabismic cats. J Neurophysiology 1983; 50: 287-296
  7. Leguire LE, Rogers GL, Bremer DL. Amblyopia: the normal eye is not normal. J Pediatr Ophthalmol Strabismus 1990; 27: 32-38
  8. Loeffler M, Wise JS, Grans M. Contrast sensitivity letter charts a test of visual function in amblyopia. J Pediatr Ophthalmol Strabismus 1990; 27: 28-31
  9. Von Noorden GK. Classifications of amblyopia. Am J Ophthalmol 1967; 63: 238-244
  10. Campos EC, Prampolini ML, Gulli R. Contrast sensitivity differences between strabismic and anisometropic amblyopia: objective correlation by means of visual evoked responses. Doc Ophthalmol 1984; 58: 45-50
  11. Abrahamsson M, Sjöstrand J. Contrast sensitivity and acuity in strabismic and anisometropic amblyopia. Br J Ophthalmol 1988; 72: 44-49
  12. Chatzistefanou KI, Theodossiadis GP, Damanakis AG, Ladas ID, Moschos MN, Chimonidou E. Contrast sensitivity in amblyopia: The fellow eye of untreated and succesfully treated amblyopes. J AAPOS 2005; 9: 468-474
  13. Hubel DH, Wiesel TN. Reseptive fields and functional archietecture in two nonstriate visual areas (18 and 19) of the cat. J Neurophysiol 1965; 28: 229-289
  14. Scottun BC, Bradley A, Freeman RD. Orientation discrimination in amblyopia. Invest Ophthalmol Vis Sci 1986; 27: 532-537
  15. Manny RE, Levi DM. Psychophysical investigation of the temporal modulation sensitivity function in amblyopia: spatiotemporal interactions. Invest Ophthalmol Vis Sci 1982; 22: 525-534
  16. Crawford MLJ, von Noorden GK. The effects of short-term experimental strabismus on the visual system in Macara multatta. Invest Ophthalmol Vis Sci 1979; 18: 496-505
  17. Wiesel TN. Postnatal development of the visual cortex and the influence of environment. Nature 1982; 299: 583-591
  18. Mitchell DE, Howell ER, Keith CG. The effect of minimal occlusion therapy on binocular visual functions