Final answer:
Blurred distance vision in adults can be caused by conditions such as myopia (nearsightedness) and astigmatism. Myopia option 3, occurs when the eye's length causes light to focus in front of the retina. Astigmatism is due to an irregular corneal or lens shape leading to uneven focus on the retina.
Step-by-step explanation:
The cause of blurred distance vision in adults could be due to a few different conditions. One such condition is myopia option 3, also known as nearsightedness, which is the inability to see distant objects clearly. Myopia occurs when the eye is too long relative to the focusing power of the cornea and lens of the eye, or when the lens of the eye is too powerful. This causes light to focus at a point in front of the retina, instead of on it, resulting in a blurry image for distant objects.
Another possible cause of blurred distance vision is astigmatism, a condition where the cornea or lens is irregularly shaped, causing light to be focused unevenly on the retina and leading to distorted or blurred vision at all distances. While cataracts can cause blurry vision, they typically affect both near and distance vision and are characterized by the clouding of the eye's lens. Lastly, glaucoma is not typically known for causing blurry distance vision; it's often associated with increased eye pressure and can lead to peripheral vision loss.