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No, that’s not true. You can use contact lenses if you have astigmatism, there are special lenses called toric lenses designed specifically to correct it.
What else can I help you with?
Why are soft contacts no good for astigmatism?
Soft lenses cannot correct astigmatism because it only has a sphere lens. For a lens to correct astigmatism it must have both sphere and cylinder lenses. Cylindrical lenses are used to correct the power of the astigmatism at a certain axis, spheres are only capable of correcting power. But it's not exactly true that soft lenses are no good for astigmatism. They are, we call them Toric contact lenses.
what contact lens gives the most true to life color change to brown?
I currently wear Freshlook Colorblends contact lenses in honey brown and my original eye color is green. I am very happy with them.
True or false. A concave lens usually produces real images?
False. A concave lens usually produces virtual images. Concave lenses cause light rays to diverge, so the image formed is located behind the lens and cannot be projected onto a screen.
Is it always necessary to use a coverslip with a wet mount to prevent soiling the objective lens?
true
Which is true of a concave lens?
it spreads light rays apart,or it is used in a camera lens.
When does a concave lens act as convex lens?
A convex lens acts as concave lens when it is kept in a medium whose optical density is higher than the lens itself. And the vice-verse is also true .i.e, a concave lens can act as convex lens too .
Once focus is achieved at one magnification a higher power objective lens can be rotated into positon without fear of striking the slide true or false?
True. Once focus is achieved with a lower magnification objective lens, a higher power objective lens can be rotated into position without fear of striking the slide because the working distance between the lens and the slide increases with higher magnification lenses.
True or false the function of the lens of the eye is to allow precise focusing of light on the retina?
True.
A convex lens can produce what?
A convex lens can converge a beam of parallel rays to a point on the other side of the lens. It is useful for reflecting and transmitting light.
When the eye is looking at objects far in the distance the lens is and the ciliary muscle is?
TRUE
When was I Cannot Believe It's True created?
I Cannot Believe It's True was created in 1983.
Why must you be careful when lowering the coarse adjustment knob on a microscope?
Depending on the lens choice, the lens may need to be very close to the sample to focus. This is especially true with the higher magnifications.You don't want to smash the lens into your sample, damaging the sample and the lens.
