Aphakia is the good topic to learn for optometrists and Ophthalmic assistants. this presentation clearly mention the treatment modalities.

2. APHAKIA
PRESENTER
SHANA SIYAD
DOA 1 ST YEAR
CHAITHANYA EYE HOSPITAL & RI
MODERATOR.
DORA BABU DEVARAPALLI

3.  Aphakia literally means absence of
crystalline lens.
 Optical point of view it is a condition in
which the lens is absent from the
pupillary area.
 Aphakia produces high degree of
hyperopia.

4. causes:
 Congenital absence of lens
 Surgical aphakia
 Trauma
1. aphakia due to absorption of len
matter
2. traumatic extrusion
3. posterior dislocation lens in
vitreous

5. Optics of aphakia
 the total power of the eye is reduced to
about +44D from +60D.
 Image formation in aphakia is magnified
with spectacles(33%), CL (10%), ACIOL (2-
5%) PCIOL(0%).
 VA in spects corrected aphakia is falsified
due to large image size.

6. Continuation….
 Total loss of accommodation due to
absence of lens.
 Binocular optical defects like
anisometropia and aniseikonia are
harmful to the development of normal
binocular functions.

7. CLINICAL FEATURES
Symptoms:
The only symptom is defective vision for
near and far.
Signs:
 Limbal scar may be seen in surgical
aphakia
 AC is deeper than normal
 Iridodonesis
 Jet black pupil

8. CONTI…
 Only two purkinjes images are seen in
aphakia.
 Slit lamp examination clarify absence of
lens from patellar fossa
 Hypermetropic small disc seen in fundus
 Retinoscopy reveals high hypermetropia.

9. TREATMENT OF APHAKIA
Optical principle::
To correct the error by convex lenses of
appropriate power, so that the image is
formed on the retina.

10. MODALITIES OF CORRECTING APHAKIA
1. Spectacles
 spectacle prescription is the most
common method of correcting
aphakia.(roughly +10).
 Cylindrical lenses also prescribed for
surgical induced astigmatism.
 An addition of +3 to+4.00D is required for
near vn to compensate for the loss of
accommodation.

11. ADVANTAGES OF SPECTS IN APHAKIA
Spects are cheap, easy and safe method
of correcting aphakia.
DISADVANTAGES OF SPECTS
 Image magnification
 Spherical aberrations
 Prismatic aberrations
 Resticted field of vision
 Decreased quality of colour vision
 Cosmetic blemish.

12. CONTACT LENSES FOR APHAKICS
Advantages:
 Less magnification of image
 Elimination of aberrations and prismatic
effects
 Wider and better field of vision
 Cosmetically more acceptible
 Better suited for uniocular aphakia

13. DISADVANTAGES OF CLS IN APHAKIA:
 More cost
 Difficult to wear, especially in old age and
childhood.
 May be associated corneal complications.

14. IOL IMPLANTATION
It is the best available method of
correcting aphakia.

15. REFRACTIVE CORNEAL SURGERY
 Keratophakia
 Epikeratophakia
 Hyperopic lasik

16. REFERENSES
 Ak khurana
 Parsons.