one pupil dilated more than other in a coma

3 Its definition lacks consensus, which is usually defined with the following features: long axial length (≥26 mm) or refractive error of −6 D or above 4 and pathological fundus changes such as posterior staphyloma, lacquer cracks, and chorioretinal atrophy. High myopia (HM) is a leading cause of visual impairment worldwide 2 and its prevalence continues to increase, especially in Asian populations. It can represent part of the optical errors that lower order aberrations such as defocus and astigmatism cannot explain. Therefore, wavefront aberrations have become an important parameter for evaluating visual quality, 1 among which higher-order aberrations (HOAs) are of great significance. The patient’s demand is not only limited to the improvement in visual acuity, but also better visual quality. Nowadays, cataract surgery has changed from a visual rescue treatment to a refractive procedure. High-myopic pseudophakic eyes with posterior staphyloma had significantly lower internal coma and less coma variations during mydriasis. Statistically significant differences were also found for the variation of modulation transfer functions (MTFs) at frequencies of 15, 30, 45, and 60 cycles/degree between the two groups ( P=0.002, 0.002, 0.004, and 0.010, respectively). After mydriasis, Strehl ratio increased significantly in high-myopic eyes, whereas decreased slightly in normal axial length eyes ( P=0.032 when compared with the variation between the two groups). Statistically significant differences were also found in the variation from 4- to 6-mm pupil sizes for internal coma ( P=0.001), internal third-order aberrations ( P=0.009), internal total HOAs ( P=0.007), and ocular coma aberrations ( P=0.006) between two groups. ResultsĬompared with normal axial length eyes, high-myopic pseudophakic eyes with posterior staphyloma had significantly lower values of internal coma both under 4-mm and 6-mm pupil sizes ( P<0.001 and 0.020), as well as internal total HOAs ( P<0.001) and third-order aberrations at 6-mm pupil size ( P=0.018). At 1 month after phacoemulsification and intraocular lens implantation, ocular and internal HOAs as well as the visual quality data in the two groups were evaluated with KR-1W analyzer before and after mydriasis. Methodsįorty eyes of 40 high-myopic cataract patients with posterior staphyloma and 20 eyes of 20 age-related cataract patients with normal axial length were recruited. They include:Ĭomplications include a prolonged vegetative state, where a person has basic functions but is not awake or alert.To evaluate the effect of pupil size on higher-order aberrations (HOAs) in high-myopic pseudophakic eyes with posterior staphyloma using KR-1W aberrometer. For example, EEG tests that show brain activity may suggest a better outlook.ĭuring recovery from brain hypoxia, people may experience several challenges. These often give a good indication of recovery. People under 25 years of age may recover better than older adults. If both eyes have fixed or dilated pupils, it suggests damage to the brain stem, which indicates a worse outlook. They may have a reduced risk of damage if the coma lasts less than 12 hours. The longer a person remains in a coma, the poorer the outcome. Also, research suggests that a person’s functional status on admission to hospital strongly indicates their recovery prospects.Īccording to the Family Caregiver Alliance, in cases of hypoxic or anoxic brain injury, other factors that predict outcome include: Having low brain oxygen levels for several hours can suggest a poorer recovery. It is difficult to predict how quickly a person will recover, but some factors can help foresee the outcome. How long a person has experienced oxygen deprivation will determine their outlook and recovery from brain hypoxia. Share on Pinterest The duration of a coma and other factors can influence the outcome of brain hypoxia.

One pupil dilated more than other in a coma