Final answer:
The correct statement that indicates understanding of post-operative cataract removal instructions is Option 4, which advises protecting the eye from injury and refraining from rubbing it.
Step-by-step explanation:
The client's understanding of the instructions following cataract removal can be assessed by their statements. Among the provided options, Option 4: I will protect my eye from injury and avoid rubbing it clearly indicates that the client has understood the post-operative care instructions. Using prescribed eye drops is an essential part of the healing process, making Option 1 incorrect. While it's important to avoid strenuous activities, complete refraining from physical activity for two weeks (Option 2) may not be necessary unless specified by the health care provider. Wearing eyeglasses all the time, including while sleeping (Option 3), is not typically recommended by health professionals. The best practice is to shield the eye from potential harm and to follow the specific guidance provided regarding the use of eyewear and physical activity.