Navaleye
The Escapac seat fitted to the A-4 was an innovative seat for its time, with a ballistic spreader to speed inflation of the parachute canopy to aid low and slow ejections before the advent of zero/zero seats.
In my time with the USN 78-81, I was unaware of any concern over the seat, although a USMC test pilot who ejected at high speed over the Chesapeake Bay did suffer bad injuries - but survived!