Combined laser-ray tracing and OCT system for biometry of the crystalline lens (Conference Presentation)

Numerical Approximations to the Solution of Ray Tracing through the Crystalline Lens

Chinese Physics Letters ◽

10.1088/0256-307x/29/7/074202 ◽

2012 ◽

Vol 29 (7) ◽

pp. 074202 ◽

Cited By ~ 2

Author(s):

A. Yildirim ◽

A. Gökdoğan ◽

M. Merdan ◽

V. Lakshminarayanan

Keyword(s):

Ray Tracing ◽

Crystalline Lens ◽

Numerical Approximations

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Fully automated laser ray tracing system to measure changes in the crystalline lens GRIN profile

Biomedical Optics Express ◽

10.1364/boe.8.004947 ◽

2017 ◽

Vol 8 (11) ◽

pp. 4947 ◽

Cited By ~ 4

Author(s):

Chen Qiu ◽

Bianca Maceo Heilman ◽

Jari Kaipio ◽

Paul Donaldson ◽

Ehsan Vaghefi

Keyword(s):

Ray Tracing ◽

Crystalline Lens

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Real and Pseudoaccommodation in Accommodative Lenses

Journal of Ophthalmology ◽

10.1155/2011/284961 ◽

2011 ◽

Vol 2011 ◽

pp. 1-8 ◽

Cited By ~ 9

Author(s):

Ioannis G. Pallikaris ◽

Georgios A. Kontadakis ◽

Dimitra M. Portaliou

Keyword(s):

Ray Tracing ◽

Ultrasound Imaging ◽

Intraocular Lens ◽

Refractive Error ◽

Pupil Size ◽

Crystalline Lens ◽

Complex Phenomenon ◽

Near Vision ◽

Pharmacological Stimulation ◽

Visual Results

In the attempt to manage presbyopia, different intraocular lens designs have been proposed such as monofocal IOLs with monovision or multifocal IOLs. Even though the lenses mentioned offer satisfactory visual results, contemporary ophthalmology has not completely answered the presbyopic dilemma by simulating the accommodative properties of the crystalline lens itself. Accommodative IOLs were designed to fill this gap and provide satisfactory vision for all distances by restoring some degree of “pseudoaccommodation.” Pseudo accommodative capability can be linked to monofocal IOL’s as well but the results are not satisfactory enough to fully support unaided near vision. Pseudoaccommodation is a complex phenomenon that can be attributed to several static (i.e., pupil size, against-the-rule cylindrical refractive error, multifocality of the cornea) and dynamic (i.e., anterior movement of the implant itself) factors. Objective measurement of the accommodative capability offered by the accommodative IOLs is extremely difficult to obtain, and different methods such as autorefractometers, retinoscopy, and ultrasound imaging during accommodative effort, ray tracing, or pharmacological stimulation have been developed but the results are sometimes inconsistent. Despite the difficulties in measuring accommodation, accommodative IOLs represent the future in the attempt to successfully “cure” presbyopia.

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