Is it permissible to benefit from mandatory health coverage to be reimbursed for the cost of eyeglasses if the invoice is for the same amount paid and is less than the specified maximum, knowing that the monthly deduction is obligatory?

Permissible insurance is only cooperative (takaful) insurance, and it is permissible to benefit from it according to the contract. Commercial insurance, however, is forbidden. Even if a person is compelled to use it, and the sin is lifted from him, it is not permissible for him to benefit from it except within the limits of what he has paid.

If the insurance is takaful, you benefit from it according to the contract. If the agreement was to reimburse only the value of the eyeglasses, then it is not permissible to add the value of the frame. If the agreement was for a specific amount regardless of the price of the eyeglasses, then it is permissible to purchase the eyeglasses and their frame with it.

If the insurance is non-takaful (forbidden), you benefit from it within the limits of what you have paid. So, if the amount paid covers both the eyeglasses and their frame, it is permissible to purchase both. Otherwise, it is not permissible to purchase the frame with it.