For internal lens cleaning, which action is recommended?

• A. Return the refractor to the manufacturer
• B. Clean with exterior lens cleaner
• C. Use a household solvent
• D. Disassemble the instrument for cleaning

Answer: (A)

Internal optical components require professional service because they are sealed and require careful handling. Cleaning the internal lenses involves disassembly, special solvents, and precise reassembly and alignment to avoid distorting vision or miscalibrating the instrument. An authorized service from the manufacturer ensures the correct procedures are followed, preserves coatings, and maintains integrity and warranty.

Exterior lens cleaner is designed for outer surfaces only and may not reach or adequately clean internal optics. Household solvents can damage coatings or seals and introduce residue or moisture. Disassembling the instrument without proper training risks misalignment or further damage and typically voids warranty.