Which condition best describes onychorrhexis?

Onychorrhexis is characterized by brittle or split nails, which aligns perfectly with the definition of the condition. This condition typically results in the nails having longitudinal ridges or splits, making them more fragile and susceptible to breaking. Factors contributing to onychorrhexis can include overexposure to harsh chemicals, frequent manicures, or an underlying health issue affecting the nail structure.

In contrast to other conditions listed, darkening of the nails might suggest a fungal infection or other issues, while injured nail beds refer to trauma and visible depressions on the nail usually indicate conditions like nail pitting or systemic health issues. Therefore, the specific nature of onychorrhexis as brittle or split nails directly relates to the correct choice, highlighting its unique impact on nail health.