本研究以各醫事機構收取自費使用特殊人工水晶體為例，探討醫材自費金額與醫事機構型態性質、規模、各縣市市場競爭及老年人口比例之關聯性。
實證結果顯示在控制醫材固定效果後，平均家戶年收入較高的地區與自費金額有顯著的正相關，顯示家庭年收入較高的地區更願意更換功能及品質符合自身所需的特殊工水晶體。單就醫院層級探討自費金額由高至低依序為基層診所、區域醫院、地區醫院及醫學中心，但加入醫療集團變數後，因醫療集團會影響醫院層級的規模的特性，故自費金額由高至低依序醫學中心、地區醫院、區域醫院及基層診所。自費金額與老年人口比例及老年人口增加率無顯著影響，推測是因為現代人長時間使用3C產品造成白內障患者有年輕化的趨勢。由醫院權屬可知公立醫院的自費金額低於私立醫院及財團法人醫院，而私立醫院及財團法人醫院對自費金額無顯著影響。

This paper aims to investigate the relationship between the self-paid amount of medical materials and the scale of medical institutions, market competition in each county, and the proportion of the elderly population with a self-paid amount of artificial intraocular lenses from each medical institution.
The empirical results show that after controlling for the fixed effect of medical materials, the regional average household annual income has a significant positive effect on the self-pay amount, which means the region with higher income are more willing to use the intraocular lenses with functions and quality that meet their needs. At the hospital level, the self-pay amount in descending order is clinics, regional hospitals, district hospitals, and medical centers. But at the hospital level and hospital group, the self-pay amount in descending order is medical centers, district hospitals, regional hospitals, and clinics. The proportion of the elderly population and the increased rate of the elderly population have no significant effect on the self-pay amount because the cataract patients tend to be younger due to the long-term use of 3C products. The self-pay amount of public hospitals is lower than private hospitals and nonprofit hospitals, and there is no significant effect between private hospitals and nonprofit hospitals.

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