ISSN: 2574-1241 Volume 5- Issue 4: 2018 DOI: 10.26717/BJSTR.2018.11.002106 Partha Haradhan Chowdhury. Biomed J Sci & Tech Res

Short Communication Open Access

Precise Information on Anisometropia

Partha Haradhan Chowdhury*1 and Brinda Haren Shah2 1M.OPTOM, ASSOCIATE PROFESSOR, PRINCIPAL, Department of , Shree Satchandi Jankalyan Samiti Netra Prasikshan Sansthan, Pauri, Affiliated to Uttarakhand State Medical Faculty, Dehradun, India

2 M.OPTOM, GUEST LECTURER, Department of Optometry, Shree Satchandi Jankalyan Samiti Netra Prasikshan Sansthan, Pauri, Affiliated to Uttarakhand State Medical Faculty, Dehradun, India

Received: : November 22, 2018; Published: : November 27, 2018 *Corresponding author: Partha Haradhan Chowdhury, M.Optom, Associate Professor, Principal, Department of Optometry, Shree

Satchandi Jankalyan Samiti Netra Prasikshan Sansthan, Pauri, Affiliated to Uttarakhand State Medical Faculty, Dehradun, India

Abstract This paper describes about Anisometropia, its types with examples and its Treatment.

Keywords: Anisometropia, Types of Anisometropia

Introduction Anisometropia is a binocular optical defect. It means it is a Simple Anisometropia binocular phenomenon because of one eye is It is subdivided into Simple Myopic Anisometropia and Simple compared to other eye. In Anisometropia, refractive error of two Hypermetropia Anisometropia. Here, one eye will be emmetropic eyes is different. If, and another eye is either Myopic or Hypermetropia.

i. RE: +0.25Ds (6/6), Eg.

ii. LE: +0.50Ds (6/6) i. RE: Plano (6/6)

This is also considered as Anisometropia, but if difference is ii. LE: -2.00Ds (6/6) +1.00Ds, then it is considered as considerable Anisometropia. Eg. This is a case of Simple Myopic Anisometropia. i. RE: +1.00Ds (6/6) i. RE: Plano (6/6) ii. LE: +2.00Ds (6/6) ii. LE: +2.00Ds (6/6) When the difference between refractive error of two eyes is This is a case of Simple Hypermetropic Anisometropia. 1.00D, then Retinal size difference will be 2%. Patient can tolerate upto 5% Retinal image difference between two eyes. It means two Compound Ansiometropia eyes Refractive error difference will be upto 2.50D, but practically It is subdivided into Compound Hypermetropic Anisometropia patient can tolerate upto 4.00D [1-3]. and Compound Myopic Anisometropia. Here, different Refractive Types of Anisometropia error is present between two eyes but both eyes have either plus power of minus power. a) Simple Anisometropia Eg: b) Compound Anisometropia a) Compound Hypermetropic Anisometropia c) Mixed Anisometropia i. +2.00Ds (6/6) d) Simple Astigmatic Anisometropia ii. +4.00Ds (6/6) e) Compound Astigmatic Anisometropia b) Compound Myopic Anisometropia f) Mixed Astigmatic Anisometropia

Biomedical Journal of Scientific & Technical Research (BJSTR) 8534 Biomedical Journal of Scientific & Technical Research Volume 11- Issue 3: 2018

i. RE: -2.00Ds (6/6) Compound Astigmatic Anisometropia ii. LE: -4.00Ds (6/6) Here, both eyes are astigmatic but of unequal degree, when it is Myopic then, Mixed Anisometropia i. RE: -2.00 Dsph/ -2.00 Dcyl*90 Another name Mixed Anisometropia is “ Antimetropia.” Here, one eye is Hypermetropic and another eye is Myopic. ii. LE: -4.00 Dsph/-4.00 Dcyl*90

i. RE: +5.00Ds When it is Hypermetropic, then

ii. LE: -5.00Ds i. RE: +2.00 Dsph / +2.00 Dcyl*90

Simple Astigmatic Anisometropia ii. LE: + 4.00 Dshph/ +4.00 Dcyl *90 It is subdivided into Simple Myopic Astigmatic Anisometropia Mixed Astigmatic Anisometropia and Simple Hypermetropic Astigmatic Anisometropia. i. RE: +2.00 Dsph/+4.00 Dcyl*90 a) Simple Myopic Astigmatic Anisometropia ii. LE: -3.00 Dsph /-6.00 Dcyl *90 Here, one eye is Emmetropic and another eye is having Myopic Treatment Anisometropia is always treated with either Aspheric design of i. RE: Plano Spectacle or otherwise Contact Lenses. In case of high amount ii. LE: 0.00/-2.00 Dcyl *90 of Anisometropia , then can be considered. b) Simple Hypermetropic Astigmatic Anisometropia References 1. William J Benjamin (2006) Borish’s Clinical (2nd Edn). Here, one eye is Emmetropic and another eye is having Hypermetropic Astigmatism. 2. Theodore Grosvenor, Theodore P Grosvenor (2007) Primary Care Optometry (5th Edn). i. RE: Plano 3. Sir Stewart Duke Elder, David Abrams (1978) Duke-Elder’s Practice of ii. LE: 0.00/+2.00 Dcyl*90 refraction.

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Cite this article: Partha Haradhan C, Brinda Haren S. Precise Information on Anisometropia. Biomed J Sci & Tech Res 11(3)-2018. BJSTR. MS.ID.002106. DOI: 10.26717/ BJSTR.2018.11.002106. 8535