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Long-term visual outcome in primary microtropia
Toshihiko Matsuo1, Yoko Kawaishi, Ryu Kuroda
1Department of Ophthalmology, Okayama University Graduate School of Medicine and Dentistry, Okayama City, Japan. matsuot@cc.okayama-u.ac.jp
Purpose:
To study the long-term visual outcome of primary microtropia.
Methods:
A retrospective review was made on 31 patients with primary microtropia with the follow-up period of 5 years or more (5-15 years, mean=9.2 years) seen during 16 years from 1985 to 2000 at Okayama University Hospital. The patients were 16 boys and 15 girls, with the age at the initial visit ranging from 5 to 16 years (mean=9.3 years).
Results:
All patients showed anomalous retinal correspondence, peripheral fusion, 10 prism diopters or smaller esodeviation at the initial and final visit. At the initial visit, TNO stereoacuity was absent in 24 patients, 480 seconds in 3, and 240 seconds in 4. The visual acuity was 0.8 or better in both eyes of 16 patients, but 0.7 or worse in 1 eye or both eyes of 15 patients. At the final visit, the 24 patients with the absence of stereoacuity still showed its absence, while stereoacuity remained unchanged or improved in the 7 patients with initial stereoacuity of 480 seconds or better. In the 15 patients with 0.7 or worse visual acuity, it improved to 0.8 or better in 7 patients while it remained 0.7 or worse in the other 8 patients. Poor visual acuity had no relation to the absence of TNO stereoacuity at the initial and final visits.
Conclusion:
Patients with primary microtropia could be largely classified into those with the absence of TNO stereoacuity throughout the course of treatment and those with some levels of stereoacuity that had a chance to improve during the follow-up.
Insights
Long-term visual outcomes for primary microtropia patients show two main groups: those with persistent absent stereoacuity and those with some stereoacuity that may improve. This impacts visual acuity prognosis.
Area of Science:
- Ophthalmology
- Strabismus Research
- Visual Neuroscience
Background:
- Primary microtropia is a common strabismus condition.
- Understanding its long-term visual prognosis is crucial for patient management.
Purpose of the Study:
- To investigate the long-term visual outcomes in patients diagnosed with primary microtropia.
- To identify factors influencing visual acuity and stereoacuity over time.
Main Methods:
- Retrospective review of 31 primary microtropia patients with over 5 years of follow-up (mean 9.2 years).
- Analysis of initial and final visual acuity, stereoacuity (using TNO test), and ocular alignment.
- Patients ranged from 5 to 16 years old at initial visit.
Main Results:
- All patients maintained anomalous retinal correspondence and peripheral fusion with small esodeviations.
- 24 patients had absent stereoacuity initially and at follow-up; 7 had some stereoacuity that remained stable or improved.
- Visual acuity improved in 7/15 patients with initially poorer vision (0.7 or worse), while 8 remained with poorer vision.
Conclusions:
- Primary microtropia patients can be categorized into those with persistent absent stereoacuity and those with potentially improving stereoacuity.
- Prognosis for visual acuity varies, with some patients experiencing improvement over the long term.