विभिन्न दूरियों पर स्थित वस्तुओं को देखने के लिए आंख के लेंस को अपना फोकस समायोजित करने में निम्नलिखित में से कौन सहायता करता है?

The crystalline lens of people at old age becomes milky and cloudy. This condition is known as:

A person's vision can become blurred over time due to _____ defects in the eye.

The human eye can see objects at different distances with contrasting illuminations. This is due to: