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Human eye ocular component analysis for refractive state and refractive surgery
- Source :
- International Journal of Ophthalmology, Vol 10, Iss 7, Pp 1076-1080 (2017)
- Publication Year :
- 2017
- Publisher :
- Press of International Journal of Ophthalmology (IJO Press), 2017.
-
Abstract
- AIM: To analyze the clinical factors influencing the human vision corrections via the changing of ocular components of human eye in various applications; and to analyze refractive state via a new effective axial length. METHODS: An effective eye model was introduced by the ocular components of human eye including refractive indexes, surface radius (r1, r2, R1, R2) and thickness (t, T) of the cornea and lens, the anterior chamber depth (S1) and the vitreous length (S2). Gaussian optics was used to calculate the change rate of refractive error per unit amount of ocular components of a human eye (the rate function M). A new criterion of myopia was presented via an effective axial length. RESULTS: For typical corneal and lens power of 42 and 21.9 diopters, the rate function Mj (j=1 to 6) were calculated for a 1% change of r1, r2, R1, R2, t, T (in diopters) M1=+0.485, M2=-0.063, M3=+0.053, M4=+0.091, M5=+0.012, and M6=-0.021 diopters. For 1.0 mm increase of S1 and S2, the rate functions were M7=+1.35, and M8=-2.67 diopter/mm, respectively. These rate functions were used to analyze the clinical outcomes in various applications including laser in situ keratomileusis surgery, corneal cross linking procedure, femtosecond laser surgery and scleral ablation for accommodation. CONCLUSION: Using Gaussian optics, analytic formulas are presented for the change of refractive power due to various ocular parameter changes. These formulas provide useful clinical guidance in refractive surgery and other related procedures.
- Subjects :
- medicine.medical_specialty
Refractive error
genetic structures
medicine.medical_treatment
Optical power
Keratomileusis
vision correction laser in situ keratomileusis
03 medical and health sciences
0302 clinical medicine
lcsh:Ophthalmology
refractive errors
Ophthalmology
Cornea
Refractive surgery
medicine
corneal collagen crosslinking
Dioptre
Gaussian optics
business.industry
medicine.disease
eye diseases
Aberrations of the eye
Basic Research
medicine.anatomical_structure
lcsh:RE1-994
030221 ophthalmology & optometry
Human eye
sense organs
business
human eye ocular components
Subjects
Details
- ISSN :
- 22274898 and 22223959
- Database :
- OpenAIRE
- Journal :
- International Journal of Ophthalmology
- Accession number :
- edsair.doi.dedup.....c36de298232d295c7f227f8611b774cf