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Woo and Choi: Clinical Course of Strabismus Developed in Siblings
Original Article

J Korean Ophthalmol Soc 2009;50(6):898-903.

Published online: 7 September 2009

DOI: https://doi.org/10.3341/jkos.2009.50.6.898

Clinical Course of Strabismus Developed in Siblings

Kyeong Jin Woo, MD, Mi Young Choi, MD

Department of Ophthalmology, Chungbuk National University College of Medicine, Chungbuk National University Medical Research Institute, Cheongju, Korea

Address reprint requests to Mi Young Choi, MD Department of Ophthalmology, College of Medicine, Chungbuk National University Hospital #410 SungBong-ro, Heungduk-gu, Cheongju 361-711, Korea Tel: 82-43-269-6335, Fax: 82-43-264-5263, E-mail: mychoi@chungbuk.ac.kr

Received 6 October 2008       Accepted 10 March 2009

Copyright © 2009 Korean Ophthalmological Society

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To determine the clinical characteristics of strabismus and the clinical course after treatment, such as surgery or glasses, in siblings with strabismus.

Methods

Siblings diagnosed with strabismus were investigated according to sex, age and type of strabismus. The initial angle of deviation and the change of angle after treatments in the same type were evaluated and analyzed. The analysis showed that therapeutic results corresponded in cases of siblings at the last visit.

Results

Fifteen out of 58 sibling couples (average age: 6.2 years old) were enrolled in this study on the same initial visit date. In the cases where sibling couples had their initial examination on different dates, siblings were on average 5.3 and 6.4 years old, irrespectively (p＜0.05). Fifty-one out of 58 sibling couples had the same type of strabismus. The deviated angles in 19 sibling couples before treatment were statistically different (p＜0.05). There was no statistical difference in the deviated angle in siblings between 3 months and 2 years of age (p＞0.05). The concordance of the final result after treatment was 68.4%, and was statistically significant.

Conclusions

There were many cases in which siblings demonstrated the same type of strabismus. In these cases, the clinical courses and final results were similar. Therefore, if one sibling was treated, the other sibling's course and result after treatment could be predicted accurately.

Keywords: Concordance, Siblings, Strabismus

References

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Table 1.
Group with the same type of strabismus in a total of 58 couples
Type of strabismus Couples Percents (%)
XT* 39 76.5
Intermittent 38 74.6
Infantile 1 1.9
ET† 12 23.5
Accommodative or partially 11 21.6
accommodative
Infantile 1 1.9
Total 51 100

* Exotropia

† Esotropia.

Table 2.
Group with different type of strabismus in a total of 58 couples
Type of strabismus Couples Percents (%)
XT* Accommodative ET† 1 14.3
XT Partially accommodative ET 2 28.5
XT Nonaccommodative ET 1 14.3
XT Superior oblique palsy 1 14.3
Infantile XT Hypertropia 1 14.3
High AC/A ratio ET Partially accommodative ET 1 14.3
Total 7 100

* Exotropia

† Esotropia.

Table 3.
Type of strabismus in the group treated for the same type of strabismus
Type of strabismus Couples Percents (%)
Intermittent XT* 14 73.7
Accommodative or partially accommodative ET† 4 21.0
Infantile ET 1 5.3
Total 19 100

* Exotropia

† Esotropia.

Table 4.
Stereopsis of the group treated for the same type of strabismus
Sibling A* Sibling B†
No stereopsis 100∼3000 <100
No stereopsis 1 1
100∼3000 1 4 1
<100 1 2 3

* one of the treated siblings

† the other of the treated siblings.

Table 5.
Fusional ability of the group treated for the same type of strabismus
Sibling A* Sibling B†§‡П
No Fusion‡ Near (+)§ Far (+)П
No fusion 3 1 1
Near (+) 5
Far (+) 1 1 1

* one of the treated siblings

† the other of the treated siblings

‡ no fusional ability at far or near

§ fusional ability at near

П fusional ability at far.

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