Which is an inappropriate method for routine maintenance on a phoropter?

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Using alcohol to wipe off all exposed phoropter parts is inappropriate because alcohol can damage certain materials commonly used in phoropters, such as plastics and coatings that are applied to the optics. This may lead to degradation, discoloration, or cloudiness, ultimately affecting the performance and precision of the instrument.

In contrast, the other methods described are more suitable for routine maintenance. Using a dust cover helps protect the unit from dust and environmental contaminants when not in use, which is essential for maintaining its condition. Cleaning the back lenses with glass cleaner is advisable when using a product that is specifically designed for optics, ensuring that the lenses are kept clear without causing damage. Using an ear syringe to blow off dust from enclosed lenses is a safe and effective technique that avoids direct contact with fragile optics and maintains their integrity.

Therefore, the inappropriate method identified is indeed the one involving the use of alcohol on all exposed parts of the phoropter.

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