Degree of Deviation Causing Amblyopia in Squint Patients
DOI:
https://doi.org/10.21276/hey8s103Keywords:
Amblyopia, Deviation, StrabismusAbstract
Background: Cases of EXO and ESO deviation in various age groups and different sexes having central and eccentric fixation were taken. Materials & Methods: Out of 53 cases, 28 were of ESO. Of all the strabismic cases maximum number of cases reported in age group of 11-20 with male preponderance. if the angle required for superimposition was zero a patient with orthophoria had NRC and with heterophora had harmonious ARC. Measurement of objective angle of deviation was done by Hirschbergs method of corneal reflex and subjective angle of deviation with Maddox Rod test with Maddox hand prisms. The angle of anomaly was calculated with Objective Angle- Subjective Angle.
Results: Maximum number of cases in up to 15 degrees were of unilateral esotropia and in 16 to 20 degrees also the cases of unilateral esotropia were maximum. However, in above 30 degree the maximum number of cases were of unilateral exotropia.
Conclusion: Amblyopia once has set in then it is very difficult to correct it even if the angle of deviation is up to 15 degree.
Downloads
References
Eggers H.M.: Amblyopia. In: Diamond G.R., Eggers H.M., ed. Strabismus and pediatric ophthalmology, Vol. 5 in Podos SM, Yanoff M, eds. Textbook of ophthalmology, London: Mosby; 1993.13.1–17
Sireteanu R., Fronius M.: Naso-temporal asymmetries in human amblyopia: consequence of long-term interocular suppression. Vision Res. 1881; 21:1055-1063.
Hess R.F., Pointer J.S.: Differences in the neural basis of human amblyopia: the distribution of the anomaly across the visual field. Vision Res. 1985; 25:1577-1594.
Hess R.F., Holliday I.E.: The spatial localization defect in amblyopia. Vision Res. 1992; 32:1319-1339.
Abrahamsson M., Fabian G., Sjostrand J.: A longitudinal study of a population-based sample of astigmatic children. II. The changeability of anisometropia. Acta Ophthalmol 1990; 68:435-440.
Birch E.E., Stager D.E.: Monocular acuity and stereopsis in infantile esotropia. Invest Ophthalmol Vis Sci. 1985; 26:1624-1630.
Birnbaum M.H., Koslowe K., Sarret R.: Success in amblyopia therapy as a function of age: a literature survey. Arch Ophthalmol 1953; 54:269-275.
Gstalder R.J., Green D.G.: Laser interferometric acuity in amblyopia. J Pediatr Ophthalmol Strabismus 1971; 8:251-256.
Flom M.L., Bedell H.E.: Identifying amblyopia using associated conditions, acuity, and non-acuity features. Am J Optom Physiol Opt 1985; 62:153-160.
Donahue S.P.: Relationship between anisometropia, patient age and the development of amblyopia. Trans Am Opthalmol Soc. 2005; 103:313-336.
Abraham S.V.: Accommodation in the amblyopic eye. Am J Ophthalmol 1961; 52:197-200.
Stuart J.A., Burian H.M.: A study of separation difficulty. Am J Ophthalmol 1963; 53:471-477.
von Noorden G.K., Burian H.M.: Visual acuity in normal and amblyopic patients under reduced illumination. I. Behavior of visual acuity with and without neutral density filters. Arch Ophthalmol 1959; 61:533-535.
Schor C.: A directional impairment of eye movement control in strabismic amblyopia. Invest Ophthalmol Vis Sci 1975; 14:692-697.
Eggers H.M., Blakemore C.: Physiological basis of anisometropic amblyopia. Science 1978; 201:264-266.
Movshon J.A., Eggers H.M., Gizzi M.S., et al: Effects of early unilateral blur on the macaque’s visual.
Downloads
Published
Issue
Section
License
Copyright (c) 2024 International Archives of BioMedical and Clinical Research
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Authors are required to sign and submit the completed “Copyright transfer Form” upon acceptance of publication of the paper. This is determined by a publishing agreement between the author and International Archives of Biomedical and Clinical Research. These rights might include the right to publish, communicate and distribute online. Author(s) retain the copyright of their work. International Archives of Biomedical and Clinical Research supports the need for authors to share, disseminate and maximize the impact of their research.