The maximum focal length of the eye-lens for a person with myopia is less than 2.5 cm because myopia causes the far point of the eye to shift closer, reducing the lens's ability to focus on distant objects.
Final Answer: The maximum focal length of the eye-lens is \( \mathbf{< 2.5 \, \text{cm}} \), which corresponds to option \( \mathbf{(1)} \).
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?