Download Self-tests in Optic and Refraction by Chua Chung Nen ,Mahadhir Alhady Sulaiman , Tan Aik Kah PDF
By Chua Chung Nen ,Mahadhir Alhady Sulaiman , Tan Aik Kah ,Ngo Chek Tung
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Additional resources for Self-tests in Optic and Refraction
Example text
True statements about anti-reflective coatings include: a. the principle of destructive interference applies to anti-reflective coatings b. the thickness of the coating is a quarter of the wavelength of the incident light c. they cause the lenses to grow dark in bright light d. they absorb ultraviolet light e. they can only be used on plastic lenses 9. Photochromic lenses: a. usually have a more rapid darkening process than lightening process b. give different tints according to the wavelengths c.
40mm. 33mm from the corneal apex, and thus straddle the back surface of the lens. 11D. 2. F The power is the same for the reduced eye and the schematic eye. In Listing's reduced eye, the principal plane lies in the anterior chamber. 3. T The concept of back vertex power is used in the calculation of a thick lens. The back vertex power is the reciprocal of the posterior vertex focal length expressed in dioptres. The posterior vertex focal length is different from the focal length of a thick lens.
The following prescription has oblique astigmatism: a. 00X45 b. 25 X85 c. 00X175 d. 25X35 e. 00X130 32 5. The following prescription has against-the-rule astigmatism: a. 25 X 180 b. 00 / -025 X 180 c. 25 X 90 d. 25 X 135 e. 25 X 90 6. In against-the-rule astigmatism: a. the horizontal meridian has more power than the vertical meridian b. a minus cylinder at 1800 will correct the astigmatism c. a plus cylinder at 1800 will correct the astigmatism d. the astigmatism may be reduced with clear corneal incision at the temporal side during cataract surgery e.