Informative. The axis marker/ line even for trial lenses with oblique axes eg. 45, 135 may indeed remain at the familiar 6 o clock position. The line only represents the degree of rotation I understand. Right?
Hi @radianceaghedo3563! Yes the mark should be stable near the 6 o’clock position. It doesn’t mark the axis of the astigmatism, it just lets the practitioner know that the lens is sitting correctly and to adjust if needed.
Sorry, it might seem a bit obvious, but how did you assess that the angle of rotation was 11 degrees based on the scale of the slit lamp at 4:00? Thank you.
Hi Manh Nguyen, as you rotate the slit beam to align with the markers, the scale at the top of the slit lamp indicates the degree of rotation. In this case it was 11 degrees anti-clockwise.
Hi Binh, Slit lamps vary, but normally there is an adjustment knob adjacent to the place where you adjust the width of the beam that will enable the beam to be rotated. There is normally a scale attached to indicate the angle of rotation. I hope that helps. - Martin
