聚光本领(集光力)。

LIGHT GATHERING POWER (LIGHT GRASP).

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目的探讨准分子激光屈光性角膜切削术（PRK）后角膜表面形态和屈光力变化。

ObjectiveTo investigate the change in corneal surface shapes and refractive powers after photorefractive keratectomy(PRK).

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尽管能看到黑洞对周围的引力，但由于真正黑洞的噬光力而使直接观察黑洞异常困难。

Real black holes’ light-swallowing abilities make them notoriously difficult to observe directly, though their gravitational effects on their surroundings can be seen.

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