Optical aberrations of the eye that decrease visual acuity are at a maximum when the pupil is largest ( about 8 mm ), which occurs in low-light conditions.
32.
However, using SLO for monitoring of individual retinal cells proved problematic because of optical aberrations created from the tissues of the anterior eye ( specifically the cornea and lens ).
33.
The reduced sensitivity to light passing near the edge of the pupil enhances human vision by reducing the sensitivity of the visual stimulus to light that exhibits significant optical aberrations and diffraction.
34.
Space-based telescopes ( such as Hubble, or a number of non-optical telescopes ) always work at their diffraction limit, if their design is free of optical aberration.
35.
JWST's optical design is a three-mirror anastigmat, which makes use of curved secondary and tertiary mirrors to deliver images that are free of optical aberrations over a wide field.
36.
These advantages stem from having fewer moving parts, optical elements optimized for one particular focal length, and a less complicated lens formula which means that they suffer from fewer problems of optical aberration.
37.
Corneal optical aberrations after photorefractive keratectomy with a larger ablation zone and a transition zone are less pronounced and more physiologic than those associated with first-generation ( 5 mm ) ablations with no transition zone.
38.
All " modal " mirrors have large cross-coupling, which in fact is good as it secures the high quality of correction of smooth low-order optical aberrations that usually have the highest statistical weight.
39.
For a general subject it does not matter if the geometry of the image is imperceptibly different from the subject; the measurable, though very small, optical aberrations of even good quality lenses do not cause problems.
40.
Camera lenses ( usually referred to as " photographic objectives " instead of simply " objectives " ) need to cover a large focal plane so are made up of a number of optical lens elements to correct optical aberrations.
