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But some experts disagree.
但一些专家不同意这一观点。
They accept that Monet painted differently in his later pictures.
他们承认莫奈在他后期的画中采用了不同的方式。
But they do not believe that his basic design ideas changed much at all.
但他们认为他的基本设计理念并没有太大改变。
He did have severe eye problems - but they did not reduce the beauty and power of his painting.
他确实有严重的眼疾，但这并没有削弱他的画作的美感和力量。
And the many people who see Monet’s paintings today would agree.
如今许多看过莫奈画作的人都会同意这一点。
Monet suffered from an eye condition called cataract.
莫奈患有一种名为白内障的眼疾。
This condition affects the eye’s lens - the clear part at the front of the eye.
这种疾病会影响眼睛的晶状体——眼睛前部的透明部分。
The lens brings together the rays of light that enter the eye.
晶状体将进入眼睛的光线聚集在一起。
It then produces the clear image of what we are looking at.
然后，它会产生我们所看到的东西的清晰图像。
The lens is very elastic - it can change shape easily.
晶状体很有弹性，它可以很容易地改变形状。
It needs to be clear and elastic to catch all the rays of light that enter the eye.
它需要是透明且有弹性的，才能捕捉到进入眼睛的所有光线。
But over time, the lens may become harder and less clear.
但随着时间的推移，晶状体可能会变得更硬，不那么透明。
The light cannot pass through it so easily.
光线无法轻易地穿过它。
So, people’s sight becomes cloudy and unclear.
因此，人们的视力会变得模糊。
In severe cases, the lens hardens completely.
在严重的情况下，晶状体会完全硬化。
Then, people can no longer see at all.
然后，人们就再也看不见了。
Cataracts can develop for several reasons.
有一些因素会引发白内障。
Some of these are difficult to prevent - such as old age, genetic eye problems, or a person’s physical environment.
其中一些是很难预防的，比如年老、遗传性眼疾，或者一个人的物理环境。
But there are other causes that may add to cataract problems.
但还有其他因素可能会增加患白内障的几率。
And these are much easier to change.
而这些因素都更容易改变。
Smoking is one example.
吸烟就是一个例子。
Health services can help by giving patients the correct treatment for their medical problems.
卫生服务部门可以根据患者的医疗问题利用正确的治疗方法来提供帮助。
This is especially important for people with diabetes or eye disease - as these can lead to cataracts if they are not treated.
这对患有糖尿病或眼疾的人来说尤其重要，因为如果不及时治疗，这些疾病可能会导致白内障。
And a good supply of clean water is also important.
此外，饮用充足的净水也很重要。
People who do not have enough water in their bodies may develop cataracts.
体内水分不足的人可能会患白内障。
