Scientists have confirmed that extended periods of detrimental (17) screen exposure can give rise to a variety of vision and neurological disorders. This mounting apprehension (18) has led many technology companies to introduce blue-light filtering solutions or restructure employee work schedules by organising digital wellness sessions, acknowledging (19) the significance of appropriate screen distance and regular eye breaks. Staring at screens for more than eight hours can result in visual complications like retinal strain, and persistent headaches over time. Many software professionals who spend long hours in front of digital screens suffer (20) from these visual impairments. Positioning the screen at eye level without hunching forward and resting the eyes for five minutes every hour can reduce the risk considerably. Prolonged screen exposure can cause disruptions in the visual system including retinal fatigue and deteriorating eyesight. When a patient reports visual difficulties, a/an evaluation (21) is carried out through an eye examination or retinal scan. Rehabilitative (22) exercises are prescribed to address the damage. Patients are additionally advised to attend (23) vision therapy sessions, whenever necessary.

The correct option is: No replacement required.

Let's analyze the context of sentence (18) and evaluate the given choices:

Contextual Analysis:
The sentence states: "This mounting apprehension (18) has led many technology companies to introduce blue-light filtering solutions..."
Here, apprehension means anxiety, worry, or concern regarding a future event or issue. The passage discusses growing worry/concern about the negative effects of extended screen exposure. Therefore, "apprehension" fits the context logically and grammatically.

Options Evaluation:

1. mobilise: A verb meaning to organize or prepare for a purpose. It does not fit grammatically as a noun following the adjective "mounting".

2. proliferation: A noun meaning rapid increase in numbers. While a noun, "mounting proliferation" is redundant and doesn't capture the psychological/social concern that leads companies to take action as effectively as "apprehension".

3. persuade: A verb meaning to cause someone to do something through reasoning. Grammatically incorrect in this position.

4. No replacement required: The highlighted word "apprehension" accurately conveys the growing concern/fear about screen-time effects.

5. suppression: A noun meaning the act of forcibly putting an end to something, which does not fit the context of growing concern.

Hence, the original word apprehension is appropriate, and no replacement is required.