The minimum distance of distinct vision (MDDV) is abnormally close in which condition?
- A Presbyopia
- B Aphakia
- C Hypermetropia
- D Myopia ✓
Explanation
The minimum distance of distinct vision (MDDV) is the nearest point at which an object can be seen clearly — equivalent to the near point of accommodation. In myopia, the eye has excess convergent power such that parallel rays are focused in front of the retina, but divergent rays from nearby objects focus on the retina. Therefore, the MDDV (near point) is abnormally close to the eye (within 25 cm), rather than at the normal 25 cm. In severe myopia, the near point may be only a few centimeters from the eye. Conversely, in hypermetropia the far point is virtual (behind the eye) and the near point is farther than normal. Presbyopia extends the MDDV beyond 25 cm due to reduced accommodation.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
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Written and medically reviewed by the StethoPrep medical team.