A. Real and erect
B. Virtual and erect✓
C. Real and inverted
D. Virtual and inverted
132. A convex lens acts as a magnifying lens if the object is placed ..........
A. Between Focus(F) and the optical center of lens✓
B. Between focus(F) and center of curvature (2F)
C. Beyond center of curvature ( 2F)
D. Anywhere
133. SI unit of power of a lens is
A. Diopter✓
B. Snellen
C. Meter
D. cm
134. 1 D is a power of lens having focal length
A. 100 cm✓
B. 10 cm
C. 1 cm
D. 1/10 cm
135. Real images formed by a single convex lens is always ..........
A. On the same side of the lens is the object
B. Inverted✓
C. Erect
D. Smaller than the object
136. Visual acuity recorded by Snellen's test chart is a measure of
A. Light sense
B. Form sense✓
C. Contrast sense
D. All
137. Subdivision of visual acuity for hyperacuity
A. Minimum visible
B. Minimum resolvable
C. Minimum discriminable ✓
D. None
Explanation:- Three subdivisions of visual acuity are: • Minimum visible-detection of the presence of a visual stimulus. • Minimum resolvable-ordinary visual acuity. • Minimum discernible-hyperacuity.
138. unit of luminous flux
A. Lux
B. Lumens✓
C. Lambert
D. Foot candles
Explanation:- Lux is unit of illuminance, the total amount of light that falls on a surface Lumens is unit of luminous flux, the total amount of light emitted in all directions. Lambert is one lumen per square cm. A foot candle is one lumen per square foot.
139. Hemeralopia is
A. Inability to see clearly in dim light
B. Inability to see clearly in bright light✓
C. Inability to see color
D. Difficulty read words
Explanation:- Nyctalopia- Night Blindness Hemeralopia- inability to see clearly in bright light Achromatopsia- color blindness Word Blindness- dyslexia hemianopia- blindness in half field of vision Amblyopia- lazy eye
140. Amblyopia can occur in all except
A. Uniocular high myopia
B. Uniocular high hypermetropia
C. Uniocular high astigmatism
D. Uniocular aphakia✓
Explanation:- Aphakia is most commonly acquired, it will not cause amblyopia. Congenital aphakia can cause amblyopia, but it is a very rare condition.
141. All are causes of irregular astigmatism except
a. Pterygium
b. Keratoconus
c. Corneal scarring
d. Cataract surgery✓
Explanation:- Post-operative astigmatism is usually regular
142. False regarding aphakia
a. High hypermetropia
b. Shallow anterior chamber✓
c. Complete loss of accommodation
d. Iridodonesis
Explanation:- Signs of aphakia Limbal scar in surgical aphakia Anterior chamber is deeper. Iridodonesis - tremulousness of iris Pupil is jet black in color. Purkinje’s image test shows only two images (normally four). Refraction reveals high hypermetropia.
143. Temporal crescent is seen typically in
a. astigmatism
b. hypermetropia
c. myopia✓
d. none of the above
144. The blurring of vision for near work occurs in
a. hypermetropia
b. presbyopia
c. both of the above✓
d. none of the above
Explanation:- Hypermetropes will accommodate for distance to see clearly. So, exessive accommodation is needed for NV, which causes difficulty and blurring in near vision, especially in high hypermetropia. That's why hypermetropia is known as long-sightedness.
145. Optical conditions of aphakia include all EXCEPT
a. loss of accommodation
b. astigmatism with the rule✓
c. enlargement of retinal image
d. Hypermetropia
Explanation:- Due to the pressing of lids in the vertical meridian the vertical curvature of the cornea will be greater than the horizontal.
- This causes small astigmatism, the resulting power will be -cyl@180 or +cyl@90. -cyl @180 or +cyl@90 is called as with the rule astigmatism.
- In surgical aphakia, because of the healing of scar vertical meridian becomes more flatter, resulting in astigmatism will be +cyl@180. This astigmatism is against the rule.
146. Unilateral aphakia is best corrected by
a. contact lens
b. intraocular lens implant✓
c. Spectacles
d. none
147. Standard power of posterior chamber intraocular lens is
a. + 20 D✓
b. +10 D
c. + 5 D
d. + 15 D
148. Cylindrical lenses are prescribed in
a. presbyopia
b. astigmatism✓
c. myopia
d. squint
149. A newborn is invariably
a. hypermetropic✓
b. myopic
c. astigmatic
d. Presbyopic
150. Astigmatism is mostly a type of
a. axial ametropia
b. index ametropia
c. curvature ametropia✓
d. spherical aberration
151. Hypermetropia causes
a. divergent squint
b. convergent squint✓
c. both of the above
d. none of the above
152. In retinoscopy using a plane mirror with a working distance of 1m, when the mirror is tilted to the right the shadow in the pupil moves to the left in
a. hypermetropia
b. myopia more than –1 D✓
c. emmetropia
d. myopia less than –1 D
153. Patients with high myopia (>6D) are at a higher risk of
a ) Retinal detachment
b) Macular degeneration
c) glaucoma
d) All of the above✓
154. The bending of a beam of light when it passes obliquely from one medium to another is known as _______.
1.reflection
2.refraction✓
3.dispersion
4.deviation
155. Ray of light passes without deviation if pass through
1. optical center
2. focus
3. center of curvature✓
4. pole
156. The convex lens always gives a real image if the object is situated beyond _______. 1.optical centre
2.centre of curvature
3.focus✓
4.radius of curvature
157. Parallel rays of light entering a convex lens always converge to _______.
1. center of curvature
2. the principal focus✓
3. optical center
4. the focal plane
158. Where should an object be placed so that a real and inverted image of the same size is obtained, using a convex lens?
1. Between O and F
2. At F
3. At 2 F✓
4. At infinity
159. SI unit of the power of a lens is ___________.
1.dioptre✓
2.cm
3.metre
4.watt
160. 1 D is the power of the lens of the focal length of ______ cm.
1.100✓
2.10
3.1/100
4.1/10
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