Which lens condition might suggest a need to increase Dk levels?

The need to increase Dk levels in contact lenses is directly related to the oxygen transmission capability of the lens material. Corneal hypoxia occurs when the cornea does not receive sufficient oxygen, which can lead to discomfort, neovascularization, and other corneal issues. By increasing the Dk value of the contact lens, you enhance the lens's ability to transmit oxygen to the cornea, thereby alleviating the hypoxic conditions and promoting healthier corneal physiology.

While apical clearance, steep fit, and center thickness may all have implications for lens fitting and comfort, they do not inherently indicate a deficiency in oxygen supply to the cornea. Therefore, they do not specifically suggest a need for increased Dk levels in the way that corneal hypoxia does.