Who would benefit the most from a low-Dk hard lens?

Who would benefit the most from a low-Dk hard lens?

• A. Hyperopes and EW
• B. Emmetropes and CW
• C. Astigmatic wearers
• D. Myopes and DW

Answer: (D)

Low-Dk hard lenses limit the amount of oxygen that reaches the cornea, so they are safest when worn only for short periods and with daily breaks. They’re not ideal for overnight or extended wear because the cornea could become hypoxic, leading to swelling and comfort issues. Because of this, the group that benefits the most are nearsighted wearers who use the lenses only during the day. These lenses work well for daily wear when the eye can rest each night. Hyperopes and astigmatic wearers often need different lens designs or higher-Dk materials to maintain corneal health, and extended wear with a low-Dk lens would increase hypoxia risk. In short, myopes who wear lenses as daily wear use are the best match for a low-Dk hard lens.

Low-Dk hard lenses limit the amount of oxygen that reaches the cornea, so they are safest when worn only for short periods and with daily breaks. They’re not ideal for overnight or extended wear because the cornea could become hypoxic, leading to swelling and comfort issues. Because of this, the group that benefits the most are nearsighted wearers who use the lenses only during the day. These lenses work well for daily wear when the eye can rest each night. Hyperopes and astigmatic wearers often need different lens designs or higher-Dk materials to maintain corneal health, and extended wear with a low-Dk lens would increase hypoxia risk. In short, myopes who wear lenses as daily wear use are the best match for a low-Dk hard lens.