Topography is a diagnostic tool that maps the cornea, the front surface of the eye. It is instrumental in identifying ocular diseases such as keratoconus and pellucid marginal degeneration, which both involve corneal thinning and can sometimes resemble high myopia. Additionally, topography helps in customizing the fit and effectiveness of orthokeratology (ortho-k) lenses used in managing myopia. This non-invasive procedure requires patients to place their chin and forehead on the machine and focus on a light. The results are available immediately, allowing for prompt diagnosis and treatment planning.