SUSPENSORY LIGAMENT FOVEA IRIS PUPIL LENS CORNEA OPTIC NERVE RETINA REEL lunexposed lilm) FILM PLANE LENS REEL [expase时lnl
Refractive power of the eye D=+60D H n=1.33 n=1 F N F 17mm 5.6mm 17mm 22.6mm Figure 1-13.Schematic eye
Refractive power of the eye
Refractive status of the eye. Emmetropla 。Emmetropia Oblect at Refractive state of the eye Infinity when parallel rays of Shortslghted light from a distant Myopla(long eye) object are brought to Object at Infinity focus on the retina with the eye at rest (i.e.not Longsighted accommodating) Hypermetropla(short eye) Object at Infinlty When out of focus on the retina Ametropia
Refractive status of the eye. • Emmetropia Refractive state of the eye when parallel rays of light from a distant object are brought to focus on the retina with the eye at rest (i.e. not accommodating) When out of focus on the retina : Ametropia
Refractive errors (Ametropia) ·Myopia Emmetropla Object (nearsightedness or shortsightedness) Shortslghted Myopta (long eye) Object t Infinity 。Hyperopia Longslghted (hypermetropia,farsightedness or; Hypermetropla (short eye) Object longsightedness) at Infinity
Refractive errors (Ametropia) • Myopia (nearsightedness or shortsightedness) • Hyperopia (hypermetropia ,farsightedness or; longsightedness)