AMCON EQ-6001 Manual do utilizador - Página 10

Procurar online ou descarregar pdf Manual do utilizador para Microscópio AMCON EQ-6001. AMCON EQ-6001 11 páginas. Lensometer

Now rotate the diopter measuring handwheel and at the same time rotate the astigmatism axis

measuring handwheel to focus spherical marking lines clearly once more. Now the reading in the

window is +1.00, which is the same as the first reading. Then rotate the diopter measuring handwheel

to focus the cylindrical marking lines clearly. At this time, the reading on the window is –2.50D,

which is the same as the second reading.

The astigmatism is –3.50D, because (-2.50D)-(+1.00D)= -3.50D. The axis direction is read

directly off of the astigmatism axis measuring handwheel, which is 30º, as shown in Fig. 15 & Fig.

16.

Fig. 15 Image at +1.00D

The final power measured is+1.00 -3.50 x 030º, which can be converted to –2.50 +3.50 x 120º.

Calculation of Prismatic Lens

To measure a prismatic lens below 5Δ, place the prismatic lens on the objective lens bearing seat

and aim its optical center at the center of the optical axis. Rotate the diopter measuring

handwheel to focus the lines of the (3) marker reticule clearly. The marking lines can be seen to

deviate from the center of (8) eyepiece reticule. The deviating direction is the base direction of

the prism lens. Rotate the astigmatism axis measuring handwheel so that the middle one of the

three green marking lines passes through the center of the (8) eyepiece reticule. The value of the

base angle of the prismatic lens can be read off according to the astigmatism axis measuring

handwheel. The prism diopters can be estimated according to the reading on the (8) eyepiece

reticule as shown in Fig. 17.

To measure a prismatic lens higher than 5Δ, the prism compensation device will be used. Rotate

the diopter measuring handwheel and turn the angle to adjust the division line on (3) marker

reticule to the proper position. Then sum the readings from the (8) eyepiece reticule and the

prism compensation device equals the prism diopter of the lens. The base angle can be read from

the prism compensation device.

Fig. 16 Image at –2.50D