How can I improve text readability in CSS for users with visual impairments?

<!-- BEGIN COPY / PASTE -->
    <style>
      body {
        font-size: 18px; /* Larger font size for readability */
        line-height: 1.6; /* Adequate line spacing */
        color: #333; /* Dark text color */
        background-color: #fff; /* Light background for contrast */
      }
      
      .high-contrast {
        color: #000;
        background-color: #f8f8f8;
      }
    </style>

    <div class="high-contrast">
      <p>This text is styled for improved readability, with high contrast and larger font size.</p>
    </div>
    <!-- END COPY / PASTE -->