OpticStudio's tool to export point clouds creates a lens.pcd file. The 11 first lines are information about the file structure, then followed by the points.

# .PCD v0.7 - Point Cloud Data file format
VERSION 0.7
FIELDS x y z
SIZE 4 4 4
TYPE F F F
COUNT 1 1 1
WIDTH 100
HEIGHT 100
VIEWPOINT 0 0 0 1 0 0 0
POINTS 10000
DATA ascii

Could someone fill in the blanks?

VERSION    ->    Tool Version Number

FIELDS       ->    Order of Coordinates

SIZE           ->    ?

TYPE          ->    Number Type? In this case Float?

COUNT       ->    ?

WIDTH        ->    Number of Data Points along the Width?

HEIGHT       ->    Number of Data Points along the Height?

VIEWPOINT ->    ?

POINTS       ->    Number of Data Points

DATA           ->    Data Encoding