Background: Andreas Nikolaus "Niki" Lauda (born 22 February 1949) is an Austrian former Formula One driver and a three-time F1 World Drivers' Champion, winning in 1975, 1977 and 1984. He is currently the only driver to have been champion for both Ferrari and McLaren, the sport's two most successful constructors. He is considered by some as one of the greatest F1 drivers of all time. More recently an aviation entrepreneur, he has founded and run two airlines (Lauda Air and Niki).
Context: A week before the 1976 German Grand Prix at the Nurburgring, even though he was the fastest driver on that circuit at the time, Lauda urged his fellow drivers to boycott the race, largely because of the 23-kilometre (14 mi) circuit's safety arrangements, citing the organisers' lack of resources to properly manage such a huge circuit- i.e. the lack of fire marshals; fire and safety equipment and safety vehicles. Most of the other drivers voted against the boycott and the race went ahead.  On 1 August 1976 during the second lap at the very fast left kink before Bergwerk, Lauda was involved in an accident where his Ferrari swerved off the track, hit an embankment, burst into flames and made contact with Brett Lunger's Surtees-Ford car. Unlike Lunger, Lauda was trapped in the wreckage. Drivers Arturo Merzario, Lunger, Guy Edwards and Harald Ertl arrived at the scene a few moments later, but before they were able to pull Lauda from his car, he suffered severe burns to his head and inhaled hot toxic gases that damaged his lungs and blood. As Lauda was wearing a modified helmet, the foam had compressed and it slid off his head after the accident, leaving his face exposed to the fire. Although Lauda was conscious and able to stand immediately after the accident, he later lapsed into a coma.  Lauda suffered extensive scarring from the burns to his head, losing most of his right ear as well as the hair on the right side of his head, his eyebrows and his eyelids. He chose to limit reconstructive surgery to replacing the eyelids and getting them to work properly. Since the accident he has always worn a cap to cover the scars on his head. He has arranged for sponsors to use the cap for advertising.  With Lauda out of the contest, Carlos Reutemann was taken on as his replacement. Ferrari boycotted the Austrian Grand Prix in protest at what they saw as preferential treatment shown towards McLaren driver James Hunt at the Spanish and British Grands Prix.
Question: How did he recover from injury?. Whats the answer?
reconstructive surgery to replacing the eyelids and getting them to work properly.