ONE HARD LNDG BY THE FO AND ANOTHER LESS THAN ADEQUATE ONE ACCOMPANIED BY RPTS OF DISCOMFORT FROM FLT ATTENDANTS LEADS A B737-400 CAPT TO FLY THE REMAINING SEGMENTS OF A FLT.

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THE FO BRIEFED AND FLEW A STANDARD STABILIZED APCH. THERE WAS A VERY FIRM TOUCHDOWN WITH NO SIDE DRIFT AND NO BOUNCE; TOUCHING DOWN ON MAINS THEN NOSE. THE LOGBOOK ENTRY WAS MADE REQUESTING A HARD LNDG INSPECTION BY MAINT. NO DAMAGE WAS FOUND BY MAINT. LEAD FLT ATTENDANT HAD RPTED THAT HE HAD NECK SURGERY IN 1995 WHERE THEY FUSED HIS VERTEBRAE. AFTER THIS LNDG HE RPTED SEEING STARS AND EXPERIENCING NUMBNESS ON THE L SIDE OF HIS FACE. HE FLEW ONE MORE LEG TO GET OFF TRIP AT HOME IN PIT. 2 DAYS LATER 'B' FLT ATTENDANT RPTED SORENESS IN HER POSTERIOR. LATER ON THAT 3RD DAY OF TRIP FO HAD A FIRM LNDG AGAIN BUT THIS WAS WITHIN NORMAL LIMITS. I SUGGESTED FO GET HIS EYES CHKED FOR DEPTH PERCEPTION. I PERSONALLY DISCUSSED BOTH LNDGS WITH CHIEF PLT OF HOME BASE AFTER TRIP. I DEBRIEFED FO ON CORRECT FLARE TECHNIQUE. I DEBRIEFED DISPATCHER; MAINT; SYS CREW SCHEDULING AND LGA STATION MGR. FO SAID HE WAS GETTING A PHYSICAL THIS MONTH. I SUGGESTED AN EYE CHK. I SUGGESTED FO NOT MAKE 40 DEG FLAP LNDGS UNLESS ABSOLUTELY NECESSARY. I FLEW THE REST OF THE LEGS.