Madd - meas
- Maddox rod
- Maddox wing
- magnetic resonance imaging
- magnification
- magnification factor
- magnifier
- magnifying glass
- magnifying lens
- magnifying power
- magnifying spectacles
- magnocellular layer
- major arterial circle of the iris
- Maklakov's tonometer
- malabsorption
- malacia
- malformation
- malfunction
- malignancy
- malignant glaucoma
- malnutrition
- malposition
- management
- manifest hypermetropia
- manual
- map-dot fingerprint dystrophy
- Marcus Gunn jaw-winking syndrome
- Marcus Gunn pupil
- Marfan's syndrome
- marginal blepharitis
- marginal conjunctiva
- marginal corneal ulcer
- marginal excision
- marginal keratitis
- marginal ray
- masking effect
- maternal
- mature cataract
- maxillary bone
- maxillary sinus