Cataracts are cloudy areas that develop within the eye lens. A healthy lens is clear like a camera's, and light has no problem passing through it to the retina at the back where images are processed. When you have a cataract, the light can't get through as easily and, as a result, you can't see as well. Cataracts often form slowly, and they don't cause symptoms like pain, redness, or tearing in the eye. Some stay small and don't affect your eyesight.
A composite flight plan is actually two flight plans-one VFR and one IFR. What makes it composite is that you will transition from one to the other at some specified point during your flight.
Nasa set to bring back supersonic passenger travel: Space agency reveals 'son of Concorde' concept it hopes could fly in 2020. Nasa has revealed radical plans for a supersonic passenger plane. The space agency has reborn its 'X-plane' project with a new supersonic jet design it hopes could one day replace passenger jets. The project is the first in a series of 'X-planes' in NASA's New Aviation Horizons initiative, introduced in the agency's Fiscal Year 2017 budget, Nasa Administrator Charles Bolden revealed.