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These charts are intended for use by pilots operating from airfields within or near Class B and Class C airspace. Coverage of Terminal Area Charts are indicated by shaded boxes on the Sectional Chart index. These charts are updated every six months, Puerto Rico-Virgin Islands annually.Charted VFR Flyway Planning Charts are printed on the backs of selected Terminal Area Charts. Separate indices show the coverage of VFR Charts (Conterminous U.S. and Alaska).hese charts are updated every six months, Puerto Rico-Virgin Islands annually. Charted VFR Flyway Planning Charts are printed on the backs of selected Terminal Area Charts. Separate indices show the coverage of VFR Charts (Conterminous U.S. and Alaska).
The morphologic characteristics of the optic disc are routinely assessed to screen, diagnose, and monitor disease in conditions such as glaucoma and optic neuropathies. Of various optic disc features, the vertical cup to disc ratio (CDR) is the most commonly used clinical measurement, particularly for the diagnosis of glaucoma. 1 Systemic and ocular processes may affect the CDR, and understanding these factors may improve the clinical assessment of this sign.