Masoumeh Ahadi¹*, Afsaneh Ebrahimi² and Shahrokh Ramin³

¹PhD in Optometry, Student Research Committee, Shahid Beheshti University of Medical Sciences, Tehran, Iran
²Ophthalmologist, Eye Clinic in Omid Hospital, Abhar, Iran
³Ophthalmologist, From Student Research Committee, Shahid Beheshti University of Medical Sciences, Tehran, Iran

*Corresponding Author: Masoumeh Ahadi, PhD in Optometry, Student Research Committee, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Received: July 06, 2023; Published: August 31, 2023

Abstract

Purpose: To measure and compare distance and near visual acuity in amblyopic patients.

Methods: This study was conducted on 250 patients with amblyopia. In all subjects, a comprehensive ophthalmic examination including visual acuity, refraction, slit lamp biomicroscopy, and funduscopy was performed. Distance visual acuity (DVA) was measured by Snellen chart at 4m and near visual acuity (NVA) was assessed by Snellen chart at 40 cm, and then DVA and NVA were compered and analyzed.

Results: In our subjects, the mean distance and near visual acuity was 0.47 ± 0.25 and 0.59 ± 0.31 respectively. The mean NVA was 1.12 ± 1.25 lines better than DVA and difference between them was statistically significant (P < 0.001). The difference between DVA and NVA was not significantly related with age (p = 0.225), spherical equivalent (P = .932) and strabismus (P = .778) and type of amblyopia (P = .067). Although all of subjects had subnormal DVA, but 25% of them had normal NVA. In mild and moderate amblyopic groups, difference between DVA and NVA was 0.14 ± 0.10 and 0.17 ± 0.15 lines respectively, but in severe amblyopic group it was 0.03 ± 0.08 line. The difference between DVA and NVA showed a significant relation with severity of amblyopia (P < 0.001). Also, the difference between DVA and NVA was 0.16 ± 0.12 in patients with history of amblyopia therapy and 0.07. ± 0.11 in patients without treatment. This difference was statistically significant (P < 0.001).

Conclusion: Our results showed that near visual acuity in amblyopia especially in mild to moderate types was significantly better than distance visual acuity. The difference between DVA and NVA showed no relation with age, spherical equivalent, strabismus, and type of amblyopia. Also, difference between the DVA and NVA in patients with history of amblyopia therapy was better than of it in non-treated subjects.

 Keywords: Amblyopia; Distance Visual Acuity; Near Visual Acuity; Screening

References

1. Hashemi H., et al. “Global and regional estimates of prevalence of amblyopia: A systematic review and meta-analysis”. Strabismus4 (2018): 168-183.
2. Webber AL., et al. “The Effect of Amblyopia on Fine Motor Skills in Children”. Investigative Ophthalmology and Visual Science 49 (2008): 594-603.
3. Webber AL. “The functional impact of amblyopia”. Clinical and Experimental Optometry 101 (2018): 443-450.
4. Levi DM. “Linking assumptions in amblyopia”. Visual Neuroscience5-6 (2013): 277-287.
5. Ciner EB., et al. “A survey of vision screening policy of preschool children in the United States”. Survey of Ophthalmology5 (1999): 445-457.
6. Busic M., et al. “Zagreb amblyopia preschool screening study: near and distance visual acuity testing increase the diagnostic accuracy of screening for amblyopia”. Croatian Medical Journal 57 (2016): 29-41.
7. Huang YQ., et al. “A near-vision chart for children aged 3-5 years old: new designs and clinical applications”. International Journal of Ophthalmology 7 (2014): 457-462.
8. Catford GV. “Amblyopia: a comparison between distance and near vision”. British Journal of Ophthalmology 40 (1956): 633-635.
9. Lennarson L., et al. “A comparison of distance and near vision in amblyopia”. Transactions of the Fifth International Orthoptic Congress Lyon, France: LIPS (1984): 329-336.
10. Christoff A., et al. “Distance versus near visual acuity in amblyopia”. Journal of AAPOS 15 (2011): 342-344.
11. Wang L., et al. “Clinical observation of near visual acuity and distance visual acuity in amblyopia children”. Chinese Ophthalmological Society 22 (2013): 266-268.
12. Chun H and Lee YC. “Comparison between distance and near visual acuity in amblyopes”. Medicine 99 (2020): 46.
13. Benetti Zagui RM. Amblyopia: Types, Diagnosis, Treatment, and New Perspectives (2019).
14. Jin P., et al. “Screening for significant refractive error using a combination of distance visual acuity and near visual acuity”. PloS One 10 (2015): e0117399.
15. Jin H and Chung SA. “Comparison of improvement rates between distance and near visual acuity in children with unilateral amblyopia”. Journal of the Korean Ophthalmological Society 56 (2015): 1432-1438.
16. Pediatric Eye Disease Investigator Group. “A randomized trial of near versus distance activities while patching for amblyopia in children aged 3 to less than 7 years”. Ophthalmology 115 (2008): 2071-2078.

Citation

Citation: Masoumeh Ahadi., et al. “Distance Visual Acuity Versus Near Visual Acuity in Amblyopia".Acta Scientific Ophthalmology 6.9 (2023): 66-71.

Copyright

Copyright: © 2023 Masoumeh Ahadi., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.