激光在医学上的首次成功应用是进行眼内手术，但是不需要切开眼球。
The laser's first big successes in medicine came from performing operations inside the eye without cutting into the eyeball.
50岁以上做过玻璃体切除手术（即将眼内的玻璃胶样物质取出）的人群，其患白内障的风险增加。
People older than age 50 who have had the vitreous gel removed from their eye (vitrectomy) have an increased risk of cataracts.
经过3个小时的手术，医生切除了海尼眼内的白内障。
In the three-hour operation, vets removed cataracts from Heini's eyes using ultrasound.
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