The human cornea is a transparent membrane which allows light to pass through it. The word corneal opacification literally means loss of normal transparency of cornea. The term corneal opacity is used particularly for the loss of transparency of cornea due to scarring. Transparency of the cornea is dependent on the uniform diameter and the regular spacing and arrangement of the collagen fibrils within the stroma. Alterations in the spacing of collagen fibrils in a variety of conditions including corneal edema, scars, and macular corneal dystrophy is clinically manifested as corneal opacity. The term corneal blindness is commonly used to describe blindness due to corneal opacity. Types
Depending on the density, corneal opacity is graded as nebular, macular and leucomatous. Nebular corneal opacity
Nebular corneal opacity is a faint opacity which results due to superficial scars involving Bowmans layer and superficial stroma. A nebular corneal opacity allows the details of the iris to be seen through the opacity. A thin, diffuse nebula covering the pupillary area interferes more with vision than a strictly localized dense leucoma, so long as the latter does not block the whole pupillary area. This is because the leucoma stops all the light which falls upon it, whereas the nebula refracts it irregularly, allowing many of the rays to fall upon the retina where they blur the image formed by the regularly refracted rays. Macular corneal opacity
Macular corneal opacity is a semidense opacity produced when scarring involves about half the corneal stroma.
Parliamentary Commissioner for the Environment, New Zealand government agency

Political parties
Spain
PCE, Communist Party of Spain or "Partido Comunista de España"
PCE(i), Communist Party of Spain (International)(1975) or Partido Comunista de España(Internacional)
PCE(m-l), Communist Party of Spain (Marxist–Leninist) or Partido Comunista de España (Marxista-Leninista)
PCE(ML), Communist Party of Spain (Marxist–Leninist) (historical) or Partido Comunista de España (Marxista-Leninista)
PCE(M-R), Workers Party of Spain–Communist Unity or Partido de los Trabajadores de España–Unidad Comunista
PCE(R), Communist Party of Spain (Reconstituted) or Partido Comunista de España (Reconstituido)

Other countries
Parti Communautaire Européen, a political party in Belgium
Partido Comunista del Ecuador, the Communist Party of Ecuador

Other
ISO 639:pce or Palaung language, spoken in Burma and neighboring countries
Passenger car equivalent, a measure of traffic flow
PCE-842-class patrol craft, U.S. Navy patrol craft escorts, many of which were transferred to the Philippine Navy
Power cost equalization, a state subsidy in Alaska
Parduice