The constant size of the eye prevents changes in image distance. Therefore, when an object is moved further from the eye, the image distance within the eye remains fixed. This adjustment is achieved by a modification in the focal length of the eye lens. The eye lens's focal length adapts to ensure the image consistently forms on the retina.
Tara's grandmother is 70 years old and has a passion for embroidery. She faces difficulty in threading the needle as the eye of the needle appears blurred. The ophthalmologist diagnosed it as an age-related disorder. 
(a) Name the eye disorder she is suffering from.
(b) How can the above defect be corrected?
(c) Where is the image formed in the above disorder?