Contact lenses are advanced medical devices worn directly on the cornea, offering an effective alternative to eyeglasses. This chapter explores their history, benefits, and types, tracing their development from early glass lenses to modern soft and gas-permeable materials. Contact lenses provide a wider field of vision and are ideal for active lifestyles. The chapter covers the unique prescription requirements for contact lenses, distinguishing them from spectacles. Various types of lenses are discussed, including soft, rigid gas-permeable, and special designs for therapeutic and cosmetic purposes. The importance of proper insertion, removal, and care techniques is emphasized to prevent complications and ensure eye health.

The chapter also addresses potential problems such as overwearing syndrome, poorly fitting lenses, and infections, offering strategies for prevention and management. By mastering these techniques and understanding the diverse applications of contact lenses, paraoptometric technicians can effectively support patients, enhancing their vision and overall eye health. The chapter provides a comprehensive guide to contact lens use, ensuring technicians are equipped with the knowledge to address patient needs and promote safe, effective contact lens wear. Understanding the benefits, proper care, and potential risks associated with contact lenses is crucial for providing optimal patient care and improving visual outcomes. This knowledge is essential for paraoptometric technicians to support patients effectively and ensure the safe use of contact lenses.