1. Class 3 Regular Incurve: The florets smoothly incurve and form a ball.

2. Class 1 Irregular Incurve: The florets ( petals ) loosely incurve and make fully closed centers. Lower florets skirted - like.

3. The influences of the light beam drift, the light beam incurve , the light beam radom tremble and etc.

4. Class 4 Decorative : The upper florets tend to incurve, lower petals generally reflex.

5. The maesurement errors in the laser collimation are mainly caused by the light beam drift, the light beam incurve and the light beam random tremble.