葉黃素 Lutein × 白內障
The highest-quality evidence (AREDS2 RCT, n=3159, NIH/NEI-funded) found NO statistically significant overall effect of lutein/zeaxanthin supplementation on progression to cataract surgery (HR 0.
The highest-quality evidence (AREDS2 RCT, n=3159, NIH/NEI-funded) found NO statistically significant overall effect of lutein/zeaxanthin supplementation on progression to cataract surgery (HR 0.96, 95% CI 0.84-1.10, P=0.54) or vision loss (HR 1.03, P=0.61). The only positive signal was a post-hoc subgroup of participants with the lowest dietary intake quintile (HR 0.68), which is hypothesis-generating, not confirmatory. The National Eye Institute explicitly states the AREDS/AREDS2 formula had no effect on the need for cataract surgery, and the FDA denied a qualified health claim for lutein and cataract for lack of credible evidence. Observational dose-response data link higher dietary intake to lower nuclear cataract risk (RR 0.75), but dietary intake cannot be equated with supplement efficacy and is confounded by overall healthy diet. The totality of evidence shows that lutein supplements provide negligible benefit for cataract in the general population, warranting grade D.
評分透明度
所有分數由 7 層證據引擎計算，過程公開可查▸查看完整決策路徑（audit trail）
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.406
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 無高階證據可裁決
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status
台灣社群幾乎不把葉黃素當白內障藥用；多數鄉民認知葉黃素主要功能是護黃斑部、過濾藍光。涉及白內障的討論多為「家中長輩有白內障/動過白內障手術後想護眼」，抱持「有吃有保庇」心態購買，對是否真能防治白內障普遍存疑，沒有人聲稱吃了就能消除或預防白內障。
無共識（社群幾乎不討論葉黃素對白內障的效果；相關討論集中在黃斑部病變與藍光護眼，對白內障多為『有吃有保庇』的安慰性補充，無人回報實際改善白內障）
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- 白內障手術（晶體乳化術合併人工水晶體植入）
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