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2. Intraocular lens power calculation - Wikipedia

   en.wikipedia.org/wiki/Intraocular_lens_power...

   The aim of an accurate intraocular lens power calculation is to provide an intraocular lens (IOL) that fits the specific needs and desires of the individual patient. The development of better instrumentation for measuring the eye's axial length (AL) and the use of more precise mathematical formulas to perform the appropriate calculations have significantly improved the accuracy with which the ...

3. A-scan ultrasound biometry - Wikipedia

   en.wikipedia.org/wiki/A-scan_ultrasound_biometry

   A-scan ultrasound biometry, commonly referred to as an A-scan (short for Amplitude scan), uses an ultrasound instrument for diagnostic testing. [1] A-scan biometry measures the axial length (AL) of the eye prior to cataract surgery in order to assess the refractive power of the intraocular lens that will be implanted.

4. List of instruments used in ophthalmology - Wikipedia

   en.wikipedia.org/wiki/List_of_instruments_used...

   making sclerocorneal tunnels in "small incision cataract surgery" •Angular keratome: making sclerocorneal tunnels in "small incision cataract surgery"; larger one used to increase the size of the incision •Side-port blade: making sclerocorneal "side port" (a secondary tunnel) tunnels in "small incision cataract surgery" •Beer's knife

5. Dilated fundus examination - Wikipedia

   en.wikipedia.org/wiki/Dilated_fundus_examination

   Cataracts: An often age-related condition that leads to gradual vision loss secondary to clouding of the lens. Examination may reveal opacification of the lens and often an absent or blunted red reflex. Dilated fundus exam allows for examination of more peripheral cataracts, as well as evaluating candidacy for cataract surgery. [9] [12]

6. Aniseikonia - Wikipedia

   en.wikipedia.org/wiki/Aniseikonia

   The absence of this lens left the patient highly hyperopic (farsighted) in that eye. For some patients the removal was only performed on one eye, resulting in the anisometropia / aniseikonia. Today, this is rarely a problem because when the lens is removed in cataract surgery, an intraocular lens, or IOL is left in its place. [citation needed]

7. Cardinal point (optics) - Wikipedia

   en.wikipedia.org/wiki/Cardinal_point_(optics)

   For a single lens surrounded by a medium of refractive index n = 1, the locations of the principal points H and H ′ with respect to the respective lens vertices are given by the formulas = ′ = (), where f is the focal length of the lens, d is its thickness, and r 1 and r 2 are the radii of curvature of its surfaces. Positive signs indicate ...