B767 captain reported losing situational awareness during taxi resulting in taxiway excursion.

Attributes
ACN	1610892
Time
Date	201901
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Route In Use	None
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 40 Flight Crew Total 15000 Flight Crew Type 1000
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Ground Event / Encounter Object Ground Excursion Taxiway

Narrative:

After crossing xxr on taxiway X3; I started my pre-takeoff briefing; the first officer went heads down to verify the departure in the FMC. Instead of starting my turn to taxi between the blue taxiway edge lights I turned to line up with outer edge lights under the aircraft. It was an optical illusion with the width of pavement I confused the edge lights as taxi lights. As soon as I started towards the edge lights I realized the mistake I was making and corrected back to the taxiway center. By that time I had hit two of the lights with the outer left main tires. We returned to the ramp and had the aircraft inspected. Rest of flight was normal.

Original NASA ASRS Text

Title: B767 Captain reported losing situational awareness during taxi resulting in taxiway excursion.

Narrative: After crossing XXR on taxiway X3; I started my pre-takeoff briefing; the First Officer went heads down to verify the departure in the FMC. Instead of starting my turn to taxi between the blue taxiway edge lights I turned to line up with outer edge lights under the aircraft. It was an optical illusion with the width of pavement I confused the edge lights as taxi lights. As soon as I started towards the edge lights I realized the mistake I was making and corrected back to the taxiway center. By that time I had hit two of the lights with the outer left main tires. We returned to the ramp and had the aircraft inspected. Rest of flight was normal.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.