What is the acceptable tolerance for the power of a rigid lens that is under +/-5.00?

The acceptable tolerance for the power of a rigid lens that is within the range of +/-5.00 diopters is indeed 0.12D. This standard is established to ensure that the lenses provide the necessary visual correction while maintaining comfort and safety for the wearer.

When it comes to rigid gas-permeable lenses, specific tolerances must be upheld, which help to meet the quality control requirements in optical manufacturing. As the power of the lens approaches or exceeds +/-5.00D, stricter tolerances are required to maintain the efficiency of vision correction. A tolerance of 0.12D means that the actual power of the lens can deviate from the prescribed power by only 0.12 diopters either way. This precision is crucial for ensuring that the optical performance is not compromised.

Understanding this tolerance is essential for practitioners as it influences fitting processes and lens orders, allowing for a high level of care in meeting the individual needs of contact lens wearers.