低視力児におけるコントラスト感度と低コントラスト視力の鋭さ
Deepak Kumar Bagga1, Anantha A G Padmanabhan1, Deiva Jayaraman1
1Institute for Vision Rehabilitation, L V Prasad Eye Institute, Hyderabad, India.
Investigative ophthalmology & visual science
|February 19, 2026
まとめ
コントラスト感度と低コントラストの視力の鋭さは,視力低下の子供では大きく異なります. 臨床的に有意義な変化は,高テスト再テストの変動性のために0.45 logCSまたは0.4 logMARを超えています.
科学分野:
- オフタルモロジック (眼科)
- ペディアトリック・ビジョン
- 低視力研究 低視力研究
背景:
- 子供の視力低下は,視覚機能の評価において重要な課題を提示します.
- コントラスト感度 (CS) と低コントラスト視敏度 (LCVA) を理解することは,小児の視力障害の管理に不可欠です.
研究 の 目的:
- 視力低下の子ども (5歳から16歳未満) の遠距離および近距離コントラスト感度 (CS) および低コントラスト視敏度 (LCVA) を,さまざまな眼疾患で調べる.
- 小児低視力集団におけるこれらの視覚機能測定の繰り返し性を評価する.
主な方法:
- 低視力 (視力の鋭さ0.3-1.3 logMARまたは視野のMDが12dBより悪い) を有する782人の子どもを募集した.
- Pelli-Robsonテストと5%と2.5%のLCVAsを使用して評価されたCSは,LEAシンボルと対照的です.
- Bland-Altman 95% 合意限度 (LoAs) を用いて,約3ヶ月間にわたって繰り返し測定することによって,134人の子供で評価された繰り返し可能性.
主要な成果:
- 47の眼疾患でCS (距離: 1.69-0.45 logCS,近く: 1.73-0.15 logCS) とLCVA (0.80-1.54 logMARで5%のコントラスト,0.94-1.58 logMARで2.5%のコントラスト) の幅広い範囲が観察されました.
- テスト再テストの有意な変動性が見つかりました:LoAsは0.44 logCS (距離),0.54 logCS (近く),0.38 logMAR (5% LCVA),0.42 logMAR (2.5% LCVA) でした.
結論:
- コントラスト感受性およびLCVA障害は,視力低下を引き起こすさまざまな眼疾患を有する子供たちの間で非常に変動します.
- CS (>0.45 logCS) またはLCVA (>0.4 logMAR) の臨床的に有意義な変化は,テスト-再テストの実質的な変動性のために,フォローアップ評価で考慮されるべきです.
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