What type of lens is used to correct myopia?
Correct!
Wrong!
A concave (minus) lens is used to diverge light rays, helping individuals with myopia see distant objects more clearly.
Which unit measures the refractive power of a lens?
Correct!
Wrong!
Diopters measure the refractive power of lenses; the higher the number, the stronger the lens.
What does the Snellen chart primarily assess?
Correct!
Wrong!
The Snellen chart measures visual acuity, or how well a person can see at a distance.
Which condition is corrected using a cylindrical lens?
Correct!
Wrong!
Astigmatism is caused by an irregular curvature of the cornea or lens, requiring a cylindrical lens for correction.
What is the near point of vision for a normal eye?
Correct!
Wrong!
The near point of a normal eye is typically around 25 cm, which is the closest point of clear vision.
Which optical instrument is commonly used to determine refractive errors?
Correct!
Wrong!
A phoropter is used during an eye exam to measure refractive errors and determine prescriptions for glasses.