Which of the following is true regarding Helmholtz theory of accomodation
Accommodation: Mechanism by which eye changes its focal length by change in curvature of crystalline human lens According to Helmhotz theory during accommodation following changes takes place during accomodating for near vison Ciliary Muscles Contract(relaxation is all around 360o) Zonules Relax Anterior Movement of Ciliary Muscles Increase in thickness of lens Decrease in equatorial diameter Presbyopia results from the loss of lens elasticity with age. Note- sphincter pupillae are present all aorund the iris they increase / decrease the size of pupil ciliary muscles and zonules control the curvature of lens
Ciliary muscles relax
Zonules contract
Posterior Movement of Ciliary Muscles
Decrease in equatorial diameter
Optics and Errors of Refraction